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SpearsĀ® Swing Check Valve With Counter Balance, 4 in Nominal, Flanged Connection, 150 psi, 73 deg F, 11-3/4 in Inlet to Outlet Length, 7-1/4 in Top to Inlet Center, Molded PVC Body, FKM O-ring Seal, Gray, 11-3/4 in L x 11-13/16 in H, Additional Information: 480 Cv Flow Coefficient, 8 in Bolts, 7-1/2 in Bolt Circle Diameter, 3/4 in Bolt Size