PVF Reference Library · Technical Reference

Push-to-Connect Fittings

Push-to-connect fittings join copper, PEX and CPVC tube by pushing the tube in until it seats. A grip ring holds the tube and an O-ring seals it, and the fittings are listed to ASSE 1061.

Ref PV-0024ASSE 1061

Draft, open for review. Check every value against the governing standard and the manufacturer’s data before use.

What it is

Push-to-connect (push-fit) fittings are used for repairs and new work on water piping without solder, glue or crimping tools. Inside the fitting body is a grip ring of stainless teeth that bites the tube, an O-ring that seals, and often a release collar that frees the tube when pressed. Most are brass or plastic bodies. Many fit CTS copper, PEX and CPVC of the same nominal size.

How to identify

The fitting ends have a plastic or metal collar around the tube opening. Many are marked with the tube types they accept, such as "CTS copper, PEX, CPVC". Look for the ASSE 1061 marking on the fitting or packaging. Some brands sell fittings for PEX only or for copper only.

Tube compatibility

Tube	Usually accepted	Needs insert stiffener	Notes
Copper type K, L, M	Yes	No	Deburr and clean the end
PEX (CTS sizes)	Yes	Often, check maker	Many fittings have a built-in liner
CPVC (CTS)	Yes	No	Cut square, deburr
PE-RT	Some	Check maker	Listed on some fittings
IPS PVC or steel pipe	No	—	Different outside diameter

How to use it

Cut the tube square with a tube cutter.
Deburr inside and outside. Burrs can cut the O-ring.
Mark the insertion depth with the maker's depth gauge.
Push the tube in until it reaches the mark.
Pull back on the tube to confirm the grip ring has set, then pressure test.

Key points

Insertion depth is the most common failure point. A tube that is not fully seated may hold for a while and then let go.
Check local code. Some codes limit push-fit fittings in concealed spaces or require access.
Push-fit fittings are for water service listed by the maker. Do not use them on gas, air or other services unless listed.
Fittings can be rotated after assembly on many brands. This is normal and not a sign of a leak.
Use a release tool or collar clip to remove. Reuse rules vary by maker.

Common mistakes

Not deburring the tube end.
Not marking insertion depth.
Using push fittings on IPS pipe that only looks the right size.
Leaving out the PEX insert where the maker requires one.

Governing standards: ASSE 1061 (push-fit fittings); NSF/ANSI/CAN 61 and 372 (potable water and lead-free); local plumbing code.

Reference only. Verify against the current governing code or standard, the manufacturer's data and the project documents before use. Apps for Distributors disclaims liability arising from reliance on this reference.

More in Technical Reference

← All PVF sheets