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Male x Male NPT check valve. Thread sizes include 1/8", 1/4", 3/8" and 1/2" . 302 Stainless Steel spring. Brass bodies have a Beryllium Copper Retainer. Maximum operating pressure is 500 psi.
COF Series Nipple Piston Check Valves
Unit of Measure
1 2 3 

Item #

Inlet

Outlet

Seal

Cracking Pressure

Body Material

COF-2M-2.5#-BU-NI N/A 1/8" Male NPT N/A 1/8" Male NPT N/A Buna-N N/A 2.5 psi N/A Nickel Plated
COF-4M-3#-BU-B N/A 1/4" Male NPT N/A 1/4" Male NPT N/A Buna-N N/A 3 psi N/A Brass
COF-4M-3#-BU-NI N/A 1/4" Male NPT N/A 1/4" Male NPT N/A Buna-N N/A 3 psi N/A Nickel Plated
COF-2M-3.5#-BU-B N/A 1/8" Male NPT N/A 1/8" Male NPT N/A Buna-N N/A 3.5 psi N/A Brass
COF-2M-3.5#-BU-NI N/A 1/8" Male NPT N/A 1/8" Male NPT N/A Buna-N N/A 3.5 psi N/A Nickel Plated
COF-4M-5#-BU-B N/A 1/4" Male NPT N/A 1/4" Male NPT N/A Buna-N N/A 5 psi N/A Brass
COF-6M-5#-BU-B N/A 3/8" Male NPT N/A 3/8" Male NPT N/A Buna-N N/A 5 psi N/A Brass
COF-8M-5#-BU-B N/A 1/2" Male NPT N/A 1/2" Male NPT N/A Buna-N N/A 5 psi N/A Brass
COF-4M-5#-BU-NI N/A 1/4" Male NPT N/A 1/4" Male NPT N/A Buna-N N/A 5 psi N/A Nickel Plated
COF-6M-5#-BU-NI N/A 3/8" Male NPT N/A 3/8" Male NPT N/A Buna-N N/A 5 psi N/A Nickel Plated
COF-8M-5#-BU-NI N/A 1/2" Male NPT N/A 1/2" Male NPT N/A Buna-N N/A 5 psi N/A Nickel Plated
COF-6M-6.5#-BU-B N/A 3/8" Male NPT N/A 3/8" Male NPT N/A Buna-N N/A 6.5 psi N/A Brass
COF-6M-6.5#-BU-NI N/A 3/8" Male NPT N/A 3/8" Male NPT N/A Buna-N N/A 6.5 psi N/A Nickel Plated
COF-4M-10#-BU-B N/A 1/4" Male NPT N/A 1/4" Male NPT N/A Buna-N N/A 10 psi N/A Brass
COF-4M-10#-BU-NI N/A 1/4" Male NPT N/A 1/4" Male NPT N/A Buna-N N/A 10 psi N/A Nickel Plated
COF-6M-12#-BU-B N/A 3/8" Male NPT N/A 3/8" Male NPT N/A Buna-N N/A 12 psi N/A Brass
COF-6M-12#-BU-NI N/A 3/8" Male NPT N/A 3/8" Male NPT N/A Buna-N N/A 12 psi N/A Nickel Plated
COF-4M-1/3#-BU-B N/A 1/4" Male NPT N/A 1/4" Male NPT N/A Buna-N N/A 1/3 psi N/A Brass
COF-4M-1/3#-BU-NI N/A 1/4" Male NPT N/A 1/4" Male NPT N/A Buna-N N/A 1/3 psi N/A Nickel Plated
COF-4M-20#-BU-B N/A 1/4" Male NPT N/A 1/4" Male NPT N/A Buna-N N/A 20 psi N/A Brass
COF-4M-20#-BU-NI N/A 1/4" Male NPT N/A 1/4" Male NPT N/A Buna-N N/A 20 psi N/A Nickel Plated
COF-4M-25#-BU-B N/A 1/4" Male NPT N/A 1/4" Male NPT N/A Buna-N N/A 25 psi N/A Brass
COF-4M-25#-BU-NI N/A 1/4" Male NPT N/A 1/4" Male NPT N/A Buna-N N/A 25 psi N/A Nickel Plated
COF-2M-5#-BU-B N/A 1/8" Male NPT N/A 1/8" Male NPT N/A Buna-N N/A 5 psi N/A Brass
COF-2M-5#-BU-NI N/A 1/8" Male NPT N/A 1/8" Male NPT N/A Buna-N N/A 5 psi N/A Nickel Plated
Unit of Measure
1 2 3