Simmons Mfg. SB 1" 400 PSI Bronze Cast Check Valve

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.