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Comparison : Item # CHH-2F2M-BU-B, CHH Series Female x Male National Pipe Thread (NPT) Buna-N Seal Piston Brass Check Valve
Item # CHH-2F2M-BU-NI, CHH Series Female x Male National Pipe Thread (NPT) Buna-N Seal Piston Nickel Plated Check Valve
Item # CHH-2F2M-BU-SS, CHH Series Female x Male National Pipe Thread (NPT) Buna-N Seal Piston Stainless Steel Check Valve
Item # CHH-2F2M-1/3#-BU-B, CHH Series Female x Male National Pipe Thread (NPT) Buna-N Seal Piston Brass Check Valve
Item # CHH-2F2M-1/3#-BU-NI, CHH Series Female x Male National Pipe Thread (NPT) Buna-N Seal Piston Nickel Plated Check Valve