Most conventional U.S. residential toilets have two visible ceramic sections—the tank and bowl—plus a group of replaceable valves, seals, linkages, supply parts, and floor-mounting components. The tank stores water, the flush valve releases it into the bowl, the fill valve replenishes the tank, and the bowl and trapway carry waste to the drain.
Knowing the name and purpose of each part makes it easier to diagnose a running toilet, slow refill, weak flush, tank leak, or leak at the floor. It also prevents a common purchasing mistake: assuming that a part labeled “universal” will fit every toilet.
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Quick overview: how a toilet works
This guide focuses on a conventional two-piece, gravity-fed toilet commonly found in U.S. homes. Its tank stores flush water. When you operate the handle or button, a linkage opens the flush valve and water falls into the bowl. Water moves through the bowl’s rim passages and trapway, carrying waste to the drain. The fill valve then admits fresh water, while the refill tube restores the bowl’s water level.
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This is different from a tankless flushometer toilet, such as many commercial restroom fixtures. A flushometer uses a valve and building water pressure rather than storing flush water in a tank. Pressure-assist toilets also use a different operating system and should not automatically be repaired with a standard gravity-toilet tank kit. EPA’s toilet technology overview explains this distinction.
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External and visible toilet parts
1. Toilet tank
The tank is the ceramic reservoir mounted behind the bowl on most two-piece toilets. It stores the water used for a gravity flush and houses most of the serviceable operating parts, including the fill valve, flush valve, overflow tube, float, refill tube, and handle linkage.
The tank’s shape is not merely decorative. Its internal components and outlet size are part of the toilet’s intended design, so replacement parts should be matched to the toilet’s brand, model, valve style, and measurements.
2. Tank lid
The tank lid is a removable ceramic cover. It protects the components from dust and accidental contact but does not operate the flush. Keep the lid supported when removing it; ceramic lids are heavy and can crack if placed on a hard edge.
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The underside of the lid may contain a model number, part number, or date marking that helps identify replacement components.
3. Toilet bowl
The bowl receives waste and flush water. Its inner rim contains passages that distribute water around the bowl, while the internal trapway carries waste toward the drain and helps retain water in the bowl to block sewer gases.
Bowl geometry, rim design, and trapway size influence flushing performance. Replacing a flapper or fill valve can correct a tank problem, but it does not change the bowl’s basic hydraulic design. A weak flush may therefore require more than a tank-part replacement.
4. Toilet seat and hinges
The seat and hinge assembly are user-contact parts mounted to the bowl. They are not part of the flushing mechanism. Replacement fit depends on the bowl’s shape, hinge spacing, and mounting style. Round and elongated seats are not interchangeable in appearance or fit, and some bowls require special hinges or bottom-mount hardware.
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A traditional side handle rotates a trip lever inside the tank. The lever lifts a chain, rod, or other actuator to open the flush valve. Other toilets use a top-mounted push button or a dual-flush button that selects a lower or full-volume flush.
If the handle moves freely without flushing, the likely problem is a disconnected chain, broken trip lever, failed actuator, or damaged flush valve. A loose handle can also result from a worn handle nut. Many handle nuts use reverse threading, so do not assume they loosen in the usual direction.
6. Water-supply shutoff valve
The shutoff valve, normally located on the wall or floor beside the toilet, controls water entering the fixture. Close it before servicing tank parts. Turn it clockwise gently; forcing a stuck valve can damage it or cause a leak around the stem or outlet.
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If the valve will not close, leaks when operated, or has a damaged outlet, the repair may require separate plumbing work before the toilet itself can be safely serviced.
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The flexible supply line connects the shutoff valve to the threaded shank of the fill valve. Supply lines vary by connection size, end style, and length. A line marketed for toilets is not automatically correct for every installation, so match both ends and avoid stretching or sharply bending the line.
Parts inside the toilet tank
8. Flush valve
The flush valve is the tank outlet. It releases stored tank water into the bowl when the toilet is flushed. In a traditional design it includes a valve seat and hinged flapper. Other designs use a canister, tower, diaphragm, or proprietary seal.
The flush valve also commonly incorporates the overflow tube. Its opening may be approximately 2 inches or 3 inches, but opening size alone does not guarantee that a replacement seal will fit. The valve’s shape, mounting arrangement, flush volume, and manufacturer design also matter.
9. Flapper or flush-valve seal
A flapper is a flexible rubber, plastic, or silicone seal that holds tank water above the flush-valve opening. When the handle lifts it, water enters the bowl. After the flush, it should settle evenly on the valve seat and stop the flow.
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Common replacement categories include:
- 2-inch flappers: common on many standard toilets.
- 3-inch flappers: used on some higher-efficiency or larger-outlet toilets.
- Tower or canister seals: used on toilets without a conventional hinged flapper.
- Dual-flush seals: designed for the particular button and flush-valve assembly.
Not every 2-inch or 3-inch replacement fits every valve. Check the existing part and the toilet model before ordering.
10. Overflow tube
The overflow tube is attached to or built into the flush-valve assembly. If the fill valve fails to shut off, excess water enters the tube and flows into the bowl rather than overflowing the tank onto the floor. The tube also commonly receives the refill tube.
The water level must remain below the top of the overflow tube. The fill valve’s critical-level mark, the overflow tube height, and the tank lever opening must have the clearances specified by the valve manufacturer. Cutting or altering an overflow tube without following the toilet or valve instructions can create a safety and performance problem.
11. Fill valve
The fill valve admits fresh water after a flush and shuts off when the tank reaches its adjusted level. It also supplies the refill tube that restores water to the bowl. A failing or obstructed fill valve may cause slow refilling, intermittent noise, continuous running, or failure to shut off. Fluidmaster’s fill-valve information describes the valve’s role in restoring the tank and bowl water levels.
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Before replacing the valve, check that the shutoff is fully open and that the supply line is not restricted. A replacement valve must fit the tank opening, connect to the supply line, and adjust to the available tank height.
12. Float or water-level control
The float tells the fill valve when the tank has reached its target water level. Older toilets commonly use a ball float attached to an arm. Modern fill valves often use an integrated float cup or another internal level-control mechanism.
Adjust the water level according to the toilet and replacement-valve instructions. Raising the level as high as possible does not necessarily improve flushing and can send water into the overflow tube or waste more water.
13. Refill tube and clip
The refill tube directs a controlled portion of incoming water into the overflow tube to replenish the bowl after a flush. A small clip holds it above the overflow opening. The tube should discharge into the opening rather than be inserted deeply enough to create a siphoning connection.
A siphoning or incorrectly positioned refill tube can cause continuous water loss. Fluidmaster’s installation instructions show the refill tube and clip as separate components and provide positioning requirements.
14. Lift chain, rod, or actuator
This linkage transfers movement from the handle or button to the flapper, canister, or other flush-valve seal. The adjustment is important:
- Too much slack may prevent the valve from opening fully, causing an incomplete flush.
- Too little slack may hold the flapper or seal slightly open, causing a constant leak.
- A chain can also catch under the flapper or interfere with the tank lid.
Button-operated and tower-style toilets may use rods or molded actuators instead of a chain, so these parts are not interchangeable by appearance alone.
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On a two-piece toilet, the tank-to-bowl gasket seals the large connection between the tank outlet and bowl inlet. A deteriorated or incorrectly sized gasket can cause water to leak between the tank and bowl, especially during a flush.
The gasket’s dimensions and shape depend on the toilet and flush-valve design. A replacement flush valve may include a gasket, but a basic fill-valve or flapper package may not.
16. Tank bolts, washers, and nuts
These fasteners secure a two-piece tank to the bowl. Rubber washers seal around the bolt openings inside the tank, while metal washers and nuts secure the bolts underneath the bowl. Tighten both sides evenly until the tank is stable; overtightening can crack porcelain. Korky’s complete repair-kit specifications illustrate the tank bolts, washers, nuts, and tank-to-bowl gasket commonly included in a full tank repair kit.
17. Tank gaskets, locknuts, and shank washers
The fill valve and flush valve pass through openings in the tank. Gaskets, rubber washers, and locknuts seal and secure those openings. Some replacement valves include the necessary sealing hardware, but packages differ. Check the contents before beginning a repair so that a missing gasket does not leave the toilet out of service.
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Parts at the floor and drain connection
18. Closet flange
The closet flange is the floor-mounted drain fitting that receives the toilet outlet and provides the slots or holes for the closet bolts. It must be securely attached, properly positioned, and high enough to support a reliable bowl seal.
A damaged, loose, corroded, or poorly positioned flange can cause rocking, wastewater leakage, or difficulty securing the bowl. A flange repair ring may be needed in some situations, but the correct repair depends on the condition of the subfloor and drain connection.
19. Wax ring or wax-free bowl gasket
A wax ring or wax-free gasket seals the toilet outlet to the closet flange. The seal is intended to prevent wastewater and sewer gases from escaping. Sioux Chief’s bowl-gasket information describes these products as creating a watertight and gas-tight connection.
A conventional wax ring is generally disturbed when the toilet is removed and should be replaced rather than reused. Some wax-free products are designed to be reusable, but only follow that practice when the specific product permits it. Wax-free alternatives may be less sensitive to deformation from temperature changes or minor alignment issues, but they still require a clean, correctly positioned flange and a stable bowl.
Water at the floor does not automatically mean the wax ring has failed. The source could be the supply line, shutoff valve, tank-to-bowl connection, bowl crack, loose mounting, failed gasket, or damaged flange. Dry the area and trace the leak before buying a part.
20. Closet bolts, washers, nuts, and caps
Closet bolts pass through the flange and anchor the bowl to the floor. Washers and nuts secure the bowl, while decorative caps cover the exposed hardware. Tighten the nuts evenly until the bowl no longer rocks, but do not use excessive force. Porcelain can crack suddenly under point pressure.
Symptoms and the parts most likely involved
| Symptom | Likely parts or causes | What to check first |
|---|---|---|
| Toilet runs continuously | Flapper or tower seal, fill valve, chain adjustment, water level, or overflow problem | Confirm the water level is not entering the overflow tube; inspect the seal and chain. |
| Periodic “ghost flushes” | Leaking flapper or canister/tower seal | Perform a dye test and inspect the valve seat. |
| Tank fills slowly | Obstructed or failing fill valve, partly closed shutoff, restricted supply line, or low supply flow | Open the shutoff fully and check the supply path before replacing the valve. |
| Tank will not refill | Closed shutoff, blocked fill valve, disconnected supply line, or failed fill valve | Verify water reaches the valve and that the float is not stuck. |
| Handle is loose or does nothing | Broken trip lever, disconnected chain or rod, or failed actuator | Lift the tank lid and observe whether the handle moves the flush valve. |
| Water leaks between tank and bowl | Tank-to-bowl gasket, tank bolts, washers, or cracked porcelain | Flush while watching the connection; do not simply tighten bolts aggressively. |
| Water leaks at the floor | Wax ring or wax-free gasket, flange, mounting, bowl crack, supply line, or shutoff | Dry all surfaces and identify whether water appears only during flushing or while the tank fills. |
| Weak or incomplete flush | Incorrect water level, worn or misadjusted flapper, obstructed rim or trapway, or a design-related issue | Check tank level and valve opening before assuming a new flapper will solve it. |
How to test for a silent tank leak
Place a few drops of food coloring or leak-detection dye in the tank without flushing. Wait and observe the bowl. If colored water appears in the bowl, tank water is escaping through the flush valve, often because the flapper or tower seal is worn or dirty. EPA provides this dye-test method in its home-maintenance guidance.
How to identify the correct replacement part
- Identify the toilet type. Determine whether it is a standard gravity tank toilet, dual-flush toilet, pressure-assist toilet, wall-hung toilet, or commercial flushometer. Standard gravity-toilet repair kits should not be assumed to fit the other systems.
- Record the brand and model. Look inside the tank, under the tank lid, on the bowl, or in the manufacturer’s documentation. KOHLER’s service-part lookup and American Standard’s parts resources are useful starting points for model-specific components.
- Inspect the flush valve. Determine whether it uses a conventional hinged flapper, a 2-inch opening, a 3-inch opening, a tower or canister seal, or a dual-flush mechanism. Korky’s compatibility guidance explains why valve style and opening size matter.
- Match the symptom to the part. A slow refill points toward the fill valve or supply path; periodic running commonly points toward the flapper or flush-valve seal; a tank-to-bowl leak suggests the large gasket or bolts; a floor leak requires checking the bowl gasket, flange, supply connection, and porcelain.
- Check package contents. A “fill valve and flapper kit” is not necessarily a complete rebuild kit. A complete kit may include the fill valve, flapper, refill tube and clip, flush valve, tank-to-bowl gasket, bolts, washers, nuts, and instructions. Compare the package contents with the parts you actually need.
- Take measurements and photographs. Photograph the tank interior before disassembly. Measure the flush-valve opening, note the supply connection, and record the tank waterline. These details are more reliable than the word “universal” on a package.
What to buy for common toilet repairs
Buy by compatibility, not by the broadest product label. The following categories correspond to common repairs, but each requires the caveats shown.
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| Repair need | Relevant product category | Compatibility check |
|---|---|---|
| Several worn tank parts at once | universal toilet repair kit | Confirm gravity-tank use, valve style, 2-inch versus 3-inch opening, tank-bolt spacing, and included hardware. |
| Slow refill or failure to shut off | toilet fill valve | Check the supply connection, adjustable height, tank clearance, and whether the float can be set to the manufacturer’s waterline. |
| Ghost flushing or a silent leak | 2-inch toilet flapper or 3-inch toilet flapper | Match the opening, hinge or mounting points, chain connection, and intended flush volume. A tower toilet needs its correct seal instead. |
| Water between the tank and bowl | Tank-to-bowl gasket and tank bolts | Match the gasket to the toilet or flush-valve model and replace damaged washers; do not overtighten porcelain. |
| Toilet removal or a verified floor-seal failure | toilet wax ring or wax-free toilet gasket | Check flange condition, bowl outlet size, flange height, and whether the selected gasket is intended for that installation. |
| Restricted or damaged water connection | Toilet supply line or shutoff valve | Match both connection sizes and the required length; a failed shutoff may need a plumber. |
A full repair kit is convenient when several tank components are worn, but replacing a single correct part is often preferable when the existing valve is proprietary or the problem has been clearly identified. Do not buy a wax ring as a general-purpose answer to every toilet leak.
Compatibility mistakes to avoid
- Calling every part universal. “Universal” usually means compatible with a defined range of toilets, not all toilets.
- Using a 2-inch flapper on a 3-inch valve, or vice versa. Measure or identify the valve before ordering.
- Installing a hinged flapper on a tower or canister valve. These systems commonly use a model-specific seal.
- Assuming a 3-inch flapper fits every 3-inch valve. Mounting tabs, chain connections, seal geometry, and flush behavior can differ.
- Replacing a tank part when the problem is in the bowl or drain. An obstructed trapway, rim passage, flange, or drain can produce weak flushing that a new flapper will not fix.
- Reusing an ordinary wax ring. Once compressed and disturbed, it may not reseal reliably.
- Overtightening tank or bowl hardware. Porcelain can crack even when the leak appears to be solved temporarily.
Do not use bleach drop-in cleaners in the tank
In-tank tablets and drop-in cleaners containing bleach or chlorine can damage rubber seals, flappers, gaskets, and other tank components. Fluidmaster’s instructions warn that this damage can lead to leaks, flooding, or property damage. Clean the bowl with a product intended for that surface and follow the toilet manufacturer’s maintenance guidance instead of placing unapproved chemicals in the tank.
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Water efficiency and WaterSense
EPA WaterSense-labeled tank-type toilets must meet both water-efficiency and flushing-performance requirements. EPA’s current residential-toilet information states that Version 1.2 of the tank-type specification remains in effect while the effective date of Version 2.0 is paused. WaterSense-labeled tank-type toilets generally use 1.28 gallons per flush or less, subject to the specification’s treatment of dual-flush models. See the current EPA residential-toilet page for the applicable details.
Installing an aftermarket fill valve, flapper, or flush valve does not automatically make an existing toilet WaterSense-certified. Certification applies to tested toilet configurations and approved combinations, and some tank-and-bowl combinations are certified only when used together as listed. EPA’s WaterSense product search should be used when certification matters.
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Safety and when to call a plumber
Turn off the shutoff valve before removing tank parts, keep the tank lid and porcelain supported, and inspect for cracks before tightening hardware. Have a licensed plumber evaluate the installation when:
- the toilet, tank, or bowl is cracked;
- the shutoff valve cannot close or begins leaking;
- the closet flange is damaged, loose, or below the finished floor;
- the toilet is wall-hung, pressure-assisted, dual-flush with unfamiliar proprietary parts, or connected to a commercial flushometer;
- sewage or sewer gas is escaping at the floor;
- the bowl rocks after proper mounting, or a leak returns after replacing the gasket;
- you cannot determine whether the water is clean supply water or wastewater.
For a simple tank repair, the correct replacement is usually identifiable by the symptom, toilet model, and valve measurements. Floor-seal and flange work is more consequential because an incorrect repair can allow hidden subfloor or wastewater damage.
Frequently Asked Questions
What are the main parts of a toilet?
The main parts are the tank, bowl, seat, flush handle or button, fill valve, float, refill tube, flush valve, flapper or flush-valve seal, overflow tube, tank-to-bowl gasket, tank bolts, supply line, shutoff valve, closet flange, wax ring or wax-free gasket, and closet bolts.
Are toilet parts really universal?
Only within a stated compatibility range. Toilets use different 2-inch and 3-inch flush valves, flappers, tower seals, dual-flush mechanisms, pressure-assist systems, and proprietary parts. Confirm the toilet model and inspect the existing valve before buying.
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A worn or poorly fitted flapper or tower seal is a common cause, but a fill valve, chain, refill tube, or incorrect water level can also be responsible. A dye test can confirm whether tank water is leaking into the bowl.
What is the difference between a wax ring and a tank-to-bowl gasket?
A wax ring or wax-free gasket seals the toilet bowl outlet to the floor flange. A tank-to-bowl gasket seals the connection between the ceramic tank and bowl on a two-piece toilet. They are used in different locations and are not interchangeable.
Should a toilet wax ring be reused?
A conventional wax ring should generally be replaced after the toilet is removed because it has already been compressed. A wax-free gasket may be reusable only if its manufacturer specifically says it is designed for reuse and the seal remains undamaged.
The Bottom Line
To identify a toilet part correctly, start with the toilet type and model, then match the symptom, valve style, opening size, connection, and included hardware. A “universal” label is only a starting point—not proof of compatibility. Replace tank seals and valves carefully, protect the porcelain, and call a plumber for damaged flanges, cracked ceramic, uncontrolled supply leaks, or sewage leakage.
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