4" PVC Swing Check Valve-Socket (S1520-40) By Spears

4" PVC True Union Swing Check Valve-Socket (S1720-40)

4" Clear PVC Swing Check Valve-Socket (S1520C-40)

4" Industrial PVC Swing Check Valve (SK-SC-040) By SK Valves

4" Cepex PVC Wafer Check Valve 08986

Manufacturer Varies 4" Flanged PVC Swing Check Valve SCOV111

PVC Swing Check Valve - 4"

4" PVC Wafer Check Valve, 8986

4" Clear PVC True Union Swing Check Valve-Socket (S1720C-40)

4" PVC Utility Swing Check Valve, Socket, EPDM, S1520-40

NDS 4" Clear PVC Swing Check Sxs PVC Utility Swing Check Valve Slip 4in - Clear 1520C40

4" PVC Utility Swing Check Valve, Threaded, EPDM, S1520-40F

4" PVC True Union Swing Check Valve-Threaded (S1720-40F)

4" PVC Swing Check Valve-Threaded (S1520-40F) By Spears

4" Clear PVC Swing Check Valve-Threaded (S1520C-40F) By Spears

4" Hayward WCV Series PVC Full Pattern Wafer Check Valve W/316 SSTL Spring