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To connect PEX pipe, first choose one compatible joining system—such as copper crimp-ring, clamp, cold-expansion or press—and use its matching fittings, tubing, rings or clamps, and tool. These systems are not interchangeable. For a basic crimp-ring joint, cut the tube square, seat a compatible insert fitting fully, position the ring as its instructions specify, crimp with the tool held perpendicular, and check the finished joint as directed. The fitting and tool instructions and your local requirements govern the work.
What should you choose before connecting PEX?
Start with the tubing’s markings and the instructions for the fitting system you plan to use. PEX connections rely on a matched set: tubing, fitting, ring or clamp where applicable, and installation tool. A tool or ring that fits physically is not necessarily approved for a particular connection system.
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The main methods covered in the Plastics Pipe Institute (PPI) joining chapter include insert fittings secured with a copper crimp ring or clamp, cold-expansion fittings, and press fittings. Choose by what is compatible with the actual tubing and fitting, what the manufacturer specifies, and whether you have the required tool and inspection method. There is no single method that is universally right for every PEX project.
| Joining method | How it makes the joint | What it requires | Important qualification |
|---|---|---|---|
| Copper crimp ring | A ribbed insert fitting goes into the tube; a copper ring is crimped over the fitting ribs. | Compatible tubing, insert fitting, correctly sized ring, crimp tool and any specified gauge. | Follow the system’s ring-positioning, tool and inspection instructions. |
| Clamp or cinch | A ribbed insert fitting goes into the tube; a compatible clamp is tightened over the ribs. | Compatible tubing, fitting, clamp and the specified clamp tool. | Do not substitute a crimp ring or crimp tool for the clamp system. |
| Cold expansion | A compatible ring and tube end are expanded, the fitting is inserted, then the tube and ring retract around it. | Compatible tubing, reinforcing ring, fitting and expansion tool. | Compatibility is product-specific. Uponor describes its ProPEX method as ASTM F1960 and cautions against generalizing its use to PEX-b or PEX-c. |
| Press | A press fitting is joined using its specified press system. | The matching fitting and compatible press tool and jaws. | PPI materials identify press-fitting standards ASTM F3347 and F3348, but there is no universal press procedure in the material cited here; use the exact product instructions. |
Before buying or starting, confirm the tubing size and type, the fitting system’s compatibility requirements, and the tool model or jaw requirements. Make sure you know how that system’s finished connection is checked. A PPI instructional-video collection includes material on PEX fittings and joining, but videos do not replace the instructions for the specific products on the job.
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A practical way to make the choice is to work backward from the products already identified for the job. Read the tube markings, then check the fitting documentation for compatible tubing, the matching ring or clamp if the method uses one, the tool and any jaw or gauge requirements. If you cannot verify that set, pause rather than treating a similar-looking component as interchangeable. Also consider whether you can obtain all of the system’s matching parts and complete the required inspection; a tool alone is not enough to establish compatibility.
There is no supported universal price comparison between these methods. The total depends on which components and tools the project requires and whether you already have compatible equipment. Compare the full set—fittings, rings or clamps, tools and any required gauge—not just the price of a fitting or tool. For a one-off repair, access to the specified tool and components may matter as much as the joining method itself.
How do you make a PEX crimp-ring connection?
The following sequence describes a general copper crimp-ring connection. It is not a substitute for the current instructions supplied with your fitting and tool: details such as exact ring position and inspection criteria are system-specific.
- Confirm the parts match. Verify that the tube, insert fitting, correctly sized copper ring, crimp tool and any required gauge belong to the same compatible system. Do not assume another brand’s tool or fitting is interchangeable.
- Cut the tube square. Use a suitable cutter and make a clean cut across the tube end. An angled or damaged end can interfere with fully seating the fitting.
- Slide on the ring and insert the fitting. Place the ring on the tube, then push the fitting into the tube until it reaches its shoulder or tube stop. Check that it is fully seated.
- Position the ring. Move the ring over the fitting ribs to the position specified by the system instructions. Do not guess at a universal distance; use the fitting or tool manufacturer’s stated placement.
- Crimp squarely. Center the crimp jaws over the ring and hold the tool perpendicular to the tube. Complete the crimp as the tool manufacturer directs. Do not make extra crimps unless the tool instructions explicitly call for them.
- Inspect the connection. Check it using the method required by that system. Where the documented procedure calls for a GO/NO GO gauge, use the correct gauge. If the connection fails the specified check, remove it and remake it according to the manufacturer’s replacement procedure rather than trying to correct it with an improvised extra crimp.
- Check the completed work. Follow the product instructions and applicable local requirements for any further inspection or testing before putting the plumbing into service.
PPI’s installation chapter emphasizes square cuts, correct ring placement and a perpendicular crimp. It warns that failing to follow the correct procedure creates a potential for leaks. Because connection details can depend on the product, apply the current instructions for the actual fitting and tool, not just a general diagram.
In practice, handle each connection as a sequence of checks rather than rushing to the crimp. Before joining, make sure the cut end is usable and the ring is already on the tube in the correct orientation if the system instructions specify one. After insertion, verify the fitting has reached its stop before moving the ring into position. Then check the tool alignment before completing the operation. Each checkpoint addresses a different potential error: the cut and seating affect the fit, the ring position affects where the connection is secured, and the perpendicular tool placement helps avoid an angled crimp.
Keep the specified gauge nearby if the procedure requires one; it is an inspection aid, not a substitute for correct assembly. If a gauge indicates that the connection does not meet the documented check, the cited PPI procedure says to remove and replace a failed crimp. Do not compensate by adding an extra crimp unless the instructions for that particular tool explicitly say to do so. Use the manufacturer’s replacement procedure for the fitting and ring you have.
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A clamp connection still uses a ribbed insert fitting, but it secures the tube with a compatible clamp and its specified tool rather than a copper ring and crimp tool. Cold expansion uses a different sequence and tool: the compatible reinforcing ring and tube end are expanded, the fitting is inserted to its stop, and the tube and ring retract around it.
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Do not use the crimp procedure for either method. For a clamp, follow the manufacturer’s requirements for fitting insertion, clamp position and tool operation. For cold expansion, follow the product-specific sequence for ring placement, expansion, fitting insertion and retraction. The Uponor cold-expansion instructions describe its ProPEX process; that brand-specific guidance is not blanket approval to use the method with every PEX tube. Uponor’s FAQ identifies ProPEX as ASTM F1960 and discusses compatibility within its system. Check the instructions for your own tubing and fitting before proceeding.
Cold expansion is not simply another way to squeeze a ring around an insert fitting. The ring and tube end are expanded with the correct expander, and the fitting is inserted while the opening is expanded; the tubing and ring then retract around it. That order is specific to the method. Do not try to use a crimp tool on a reinforcing ring or use a crimp-style ring with an expansion fitting. When working with a named system such as ProPEX, follow that system’s product compatibility statements. Uponor’s guidance cautions about use with PEX-b or PEX-c, so do not extend its instructions to other tubing without checking the relevant manufacturer’s approval.
For clamp or cinch connections, the clamp is also distinct from a copper crimp ring. The fitting remains an insert fitting, but the compatible clamp and tool perform the securing step. Use the specified clamp position and tool sequence; do not infer those details from a crimp-ring diagram. Press fittings are another separate category, and a press tool’s jaws and operating procedure must match the product instructions. PPI materials identify ASTM F3347 and F3348 press fittings, but the standards references do not provide a universal field procedure for every press product.
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The required kit depends on the joining method. For a crimp-ring connection, plan on compatible PEX tubing, an insert fitting, the correctly sized copper ring, a suitable tube cutter and the compatible crimp tool. Add the specified GO/NO GO gauge if the system’s inspection procedure calls for one. A clamp connection needs its compatible fitting, clamp and clamp tool instead. Cold expansion requires the matching reinforcing rings, fittings and expansion tool; press fittings require their specified press tool and compatible components.
Do not choose a tool by appearance alone. Confirm the tube size and system compatibility in the product documentation, and check that the tool is approved for the particular fittings and rings or clamps. Tool requirements, acceptable inspection methods and replacement steps can vary. If the tool manufacturer specifies setup, maintenance or calibration procedures, follow those instructions; do not substitute a visual guess for a required gauge or check.
Before purchasing, make a short parts list for the chosen method. For crimp, that means checking the tubing, insert fitting, correctly sized ring, crimp tool and any required gauge. For clamp, check the matching clamp and clamp tool as well as the insert fitting and tubing. For cold expansion, the list includes compatible reinforcing rings, fittings and expansion tool. For press, confirm the fitting, tool and jaws identified by the product instructions. This avoids discovering halfway through the job that a consumable or inspection item is missing.
The materials reviewed do not establish one tool as a fit for every brand, tube size or joining method. Confirm compatibility in the documentation instead of relying on visual similarity or a general claim about a tool. Product instructions also govern setup and use; the existence of a gauge, for example, does not mean that the same gauge or acceptance criteria apply to every crimp system.
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What mistakes can cause a PEX connection to leak?
The most preventable problems are using mismatched components, making a poor cut, failing to seat the fitting, placing a ring or clamp incorrectly, and operating the tool at an angle or contrary to its instructions. PPI’s installation guidance ties correct procedures to leak prevention, so a connection that merely looks plausible should not be treated as acceptable if it fails the system’s specified check.
- Parts do not belong to one compatible system: stop and verify product markings and documentation before joining. Do not mix systems based only on similar dimensions.
- The tube cut is angled or damaged: make a fresh square cut and inspect the end before inserting the fitting.
- The fitting is not fully seated: check that it reaches the fitting’s shoulder or tube stop before positioning the ring or clamp.
- The ring or clamp is misplaced: use the specified position for that system, not a remembered measurement from another product.
- The tool is angled or the connection fails inspection: follow the tool and fitting manufacturer’s replacement procedure. For a failed crimp, PPI’s described procedure calls for removing and replacing the connection; do not rely on an extra crimp unless the tool instructions explicitly require it.
- The procedure is for another joining method: stop and use the correct instructions for crimp, clamp, expansion or press. Their tools and joining sequences are different.
If a finished joint leaks or does not pass its required check, do not conceal it or assume a second operation will make it sound. Isolate the work as needed and remake or repair it using the manufacturer’s specified procedure. Where the project’s scope or local rules require a qualified plumbing professional, contact one.
Two tempting shortcuts are particularly risky: making assumptions from a video showing a different method, and using a tool that appears to fit because it is already on hand. A video may demonstrate a crimp, clamp, expansion or press system, each with a different component set and sequence. Likewise, similar dimensions do not prove that a fitting, ring, clamp or tool is approved for the tube. Stop if markings or instructions leave compatibility uncertain.
What should you check before using a new PEX installation?
Use the inspection and commissioning steps required by the system manufacturer and the authority that governs the project. Connection checks can differ between joining methods, so there is no single gauge or visual test that applies to every PEX joint. Confirm that each connection passed its prescribed inspection and that any additional project or code requirements have been met before the line is put into service.
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For an individual connection, keep a record of which system and product instructions apply if the work involves several types of fittings. This helps avoid applying the wrong gauge check or replacement procedure later. If the tube markings, fitting documentation or required inspection method are unavailable, do not guess at the acceptance criteria. Obtain the current product instructions or ask the manufacturer or a qualified plumbing professional how to proceed.
Which PEX connection method should you use?
Use the method for which you can obtain a compatible, documented set of tubing, fittings, consumables and tools—and whose installation and inspection directions you can follow. A crimp system is a reasonable choice only when its ring, fitting, tool and gauge requirements align; a clamp, cold-expansion or press system likewise depends on its own compatible components and instructions.
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Compare systems on compatibility, the required tool and consumables, the quality-check procedure, and whether matching parts are available for the project. Do not choose based on a claim that one method is always best: the supplied guidance does not support a universal winner. PPI’s third-edition PEX guide overview identifies a broader design and installation reference, while the specific product’s instructions control the connection you are making.
For a reader choosing among methods, the key distinction is not just how the joint looks after assembly. Ask whether the tubing and fitting are compatible, what standard or system applies, which exact tool and consumables are required, how the completed connection is checked, and whether all matching parts are available. A method that cannot be inspected as directed or for which the correct tool is unavailable is not a sound shortcut. The right choice is the documented system you can assemble and verify, subject to local requirements.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to use the PEX references
The PPI joining chapter is the broad reference here for categories of PEX joining systems. Its installation chapter supplies general crimp guidance, including square cutting, full insertion, ring positioning, perpendicular tool placement and the gauge check documented for that procedure. The installation PDF reflects older copyright material, so use it as background rather than as a substitute for current instructions supplied with the product.
The PPI overview says the third edition of the broader design guide was published in April 2026 and prepared by Home Innovation Research Labs. The guide is a joint industry publication involving PPI, the Plastic Pipe and Fittings Association, and Home Innovation Research Labs, with IAPMO and ICC support. For a live installation, the latest applicable manufacturer instructions and the local authority’s requirements remain decisive.
Frequently Asked Questions
What does ASTM F1960 mean on a PEX connection?
In the cited material, Uponor identifies its ProPEX cold-expansion connection as ASTM F1960. Treat that as a reference to that joining system and confirm the compatibility statements for the exact products you have; it is not a reason to assume every PEX tube or fitting can use the same procedure.
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Why do PEX connection videos show different steps?
They may be demonstrating different joining systems: a crimp ring, clamp, cold-expansion ring or press fitting. A video for one system cannot establish the correct tool, component compatibility or inspection procedure for another.
Which PEX installation guide is the latest edition in the cited sources?
PPI’s guide overview identifies its third edition as published in April 2026. It is a general design and installation reference; for a particular connection, also follow the current instructions supplied with the fitting and tool.
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Can you use a crimp tool for a PEX clamp connection?
No. A clamp connection uses its compatible clamp and specified clamp tool; a copper crimp-ring system uses a ring and crimp tool. They are different joining systems, so use the components and sequence documented for the product you selected.
Can you mix PEX fitting brands or tools?
Do not assume that parts are interchangeable because they fit together physically. Verify compatibility for the exact tubing, fitting, ring or clamp, and tool in the product documentation. If you cannot confirm the combination, do not make the joint.
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What should you do if a crimp connection fails its gauge check?
Follow the fitting and tool manufacturer’s replacement procedure. The PPI installation procedure described here calls for a failed crimp to be removed and replaced; do not try to fix it with an extra crimp unless the specific tool instructions explicitly require that.
Does a PEX connection need a special test after assembly?
The required check depends on the joining system and project. Use the inspection procedure in the product instructions and meet any applicable local requirements. A GO/NO GO gauge is specified for the crimp procedure discussed in PPI’s installation chapter, not as a universal test for every PEX joint.
Which PEX joining method is cheapest?
The sources do not establish a universal price winner. Compare the total required components and tools for the system you can use, including fittings, rings or clamps, tool requirements and any specified gauge. Availability and equipment already on hand affect the project cost.
The Bottom Line
Choose a compatible PEX joining system before starting, then use its matching fittings, consumables, tool and inspection procedure. For crimp-ring joints, cut square, seat the fitting fully, position the ring as specified and crimp perpendicular. If compatibility or the required check is unclear, stop and consult the current product instructions and local requirements.
