The Quiet Check Valve 1-1/2" PVC Clear with 1/2 lb Spring Union x Union 1-1/2"

SIMMONS: In-Line Spring-Loaded Check Valve 1-1/4" FNPT x 1-1/14" FNPT 400 PSI

Matco-Norca 525T05LF - 1" FNPT In-Line Spring Check Valve

1/2" FNPT Threaded Lead-Free Brass Spring Check Valve, 200 WOG

The Quiet Check Valve 1-1/2" PVC Clear with 1/2 lb Spring Union x Union 1.5"

RWV Corp 232AB LF Brass In-Line Check Valve 1"FNPT 200 PSI Spring Ld

CHK SST 210-2F2M-F Stainless Steel Spring Check Valve – 1/8 FNPT x MNPT

Legend 3/4" Brass Swing Check Valve - 105-104NL T451 Inline, FNPT x FNPT 200 WOG