Cracking pressure: 1-5 PSI Ports: 1/4" FPT inlet x 1/4" FPT outlet Material: Brass Body, Buna-N seal Size: .69" x 1.80" lg. Included in: Check Valve Upgrade Kit (RPI Part #CMK247) and Check Valve Upgrade Kit (RPI Part #CMK248) Fits: Manifold Assembly