Various types of PEX fittings and connection systems

Various types of PEX fittings and connection systems

PEX Fitting PEX Fitting Type Material* ASTM Standard Connection method(s) PEX Tubing Compatibility Manufacturers/
Price Factor+
Crimp Brass F1807 Crimp (Crimp Tool + Crimp Rings)


Clamp (Cinch Tool + Cinch Clamps)
Yes Yes Yes No Everhot
A.Y. McDonald
Poly F2159 1
(Push-fit, Push-to-connect)
Brass None No tools required Yes Yes Yes No OmniGrip
Poly John Guest
Expansion Brass F1960 Expander Tool + PEX Sleeves Yes No No No Uponor (Wirsbo)
Sioux Chief
Poly 2
Brass F2080 Expander Tool + Compression Tool + Brass Sleeves Yes No No No Rehau
Sioux Chief
Compression Brass None No special tools required No No No Yes Everhot
Uponor (Wirsbo)
Press Brass None Press (Press Tool + Steel Sleeves) Yes Yes Yes Yes** Viega 3
Brass No No No Yes Watts
* Primary or the only material used. Brass alloy most commonly used in lead-free PEX fittings is either C46500 or EcoBrass. Poly alloy refers to PPSU (Polyphenylsulfone) in all crimp and expansion fittings and other alloys for push type fittings (John Guest and Watts).
** Viega FostaPEX only.
+ Pricing on scale from 1 to 5 (lowest priced to highest priced) based on averages from multiple vendor comparisons.

PEX Crimp Fittings
Crimp style fittings are the most common and affordable type of PEX fittings and can be found in majority of supply houses, home improvement stores and online stores.
Brass PEX crimp fittings are manufactured to ASTM F1807 standard. Poly alloy PEX crimp fittings are manufactured to ASTM F2159 standard.
Both types are compatible with all types (A, B, C) and brands of PEX tubing and can be installed using either one of the following methods:
Crimp Method: requires a PEX Crimp Tool and Copper Crimp Rings (also made to ASTM F1807)
Clamp (Cinch) Method: requires a PEX Clamp (Cinch) Tool and Stainless Steel (Cinch) Clamps (made to ASTM F2098).

Push PEX Fittings
Push-Fit or Push-To-Connect fittings are the only ones which do not require any PEX tools or rings to make a connection with tubing. A special composite mechanism securely locks and seals the pipe, preventing it from leaking or popping out of the fitting. Push fitting can be disconnected from the tubing with a help of a disconnecting clip or tool.
These fittings can be manufactured from brass or poly alloy and are compatible with all types of PEX as we all CPVC and copper piping.

Expansion PEX Fittings
All expansion fittings can be divided into (2) major groups:
1. Uponor (Wirsbo) ProPEX expansion system: proprietary style expansion fittings + expander tool + PEX sleeves. Both brass and poly fittings manufactured to ASTM F1960 standard.
2. Rehau RauPEX expansion system: proprietary style expansion fittings + expander tool + compression tool + brass sleeves. Fittings manufactured to ASTM F2080 standard.
Expansion style fittings can be used only with PEX-A tubing and are not compatible with other PEX tubing types.

Compression PEX-AL-PEX Fittings
Unlike most other connection methods, compression fittings do not require a PEX tool. Design of the fitting incorporates a split O-ring and a nut, used to tighten over the PEX-AL-PEX pipe and secure it over the fitting. PEX-AL-PEX compression fittings can be identified by (2) rubber O-rings over the fitting’s barbs.

Press PEX Fittings
Press fittings are installed using a PEX press tool and press sleeves and are available for either PEX tubing (Viega press system, incl. FostaPEX) or PEX-AL-PEX tubing (Watts, Uponor).
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