PumpSpy Silent Check Valve - 1-1/2" with Buna-N Couplings, Model CV-150, Spring-Loaded Flapper, Sump Pump Life Expectancy Increase, Includes Steel Clamps Fit 1-1/2″ Pipe

Little Giant CV-10 Check Valve for the following Little Giant Series Condensate Pumps - VCC, VCMA, VCL-14 and VCL-24, 1/4-inch MNPT x 3/8-inch Barbed, Black, 599065

Merrill MFG CVNL100 1" No-Lead Brass Check Valve 700 Series, 1"

Valterra P23415LF 1/2" Lead-Free Check Valve

Quickun 1/2" Barb Hose One Way Inline Check Valve Non Return Ozone Resistance PVDF Plastic One-Way Fuel Oil Water Gas Pump Air Check Valve, 2 Pcs

Superior Pump 99555 Universal Check Valve, Plastic, Fits all 1-1/4-Inch or 1-1/2-Inch MIP or FIP, Black (Pack of 1)

Control Devices-M2525-1WA Brass Ball Check Valve, 1/4" NPT Male

Midline Valve PVC Inline Check Valve for Backflow Prevention 1-1/2'' Solvent Connections White Plastic (4I2T112)

TAISHER 1PCS 304 Stainless Steel 1/4" NPT Female Check Valve,Backflow Prevention,One Way Non-Return Check Valves

EZ-FLO Brass In-Line Check Valve, 3/4 Inch IPS, Stainless Steel Spring, 20403LF