Parts 2O™ FP0026-10-P2 In-Line Sump Pump Check Valve, 1-1/4" or 1-1/2"Parts2O In Line Sump Pump Check Valve fits 1 1 4" or 1 1 2" discharge pipes. Simple hose clamp connection. Designed to allow connection to pipes on both ends (inline installation). Flapper designed to help prevent pumped water from flowing back into the basin. Inline sump pump check valve For 1 1 4" or 1 1 2" lines installation Includes 2 rubber reducing sleeves and 4 stainless steel clamps Ready to install on 1 1 2" discharge pipe Reverse reducer