Amazon: SIMMONS 504SB Sb Check Valve, 1-1/4 in, FPT, 400 Psi ...
SIMMONS check valve, series: SB, 1-1/4 in, 400 psi, fpt end connection, water, oil, gas, silicon Bronze cast body, stainless steel spring, stainless steel washer and stainless steel locknut trim, buna-n o-ring softgoods, 3-D/4 in overall length, 2-1/4 in overall width, nsf/ansi 372, for well water systems. ...