Simmons 503SB Check Valve – 1 in.

Silicon bronze cast body and poppet contain less than 0.05% Lead. Furnished with Buna ‘N o-ring stainless steel spring washer and locknut. All valves through 1-1/2 have a working pressure of 400 PSI. All valves 2 and larger have a working pressure of 600 PSI.