Plumbeeze 1-1/4 in. or 1-1/2 in. In-Line Sump Pump Check Valve features a durable sonic welded ABS construction designed for long-lasting performance. Its full-flow design and rubber flapper ensure a positive seal, preventing backflow effectively. This check valve includes two reversible rubber coupling sleeves sized 1-1/4" x 1-1/2" along with stainless steel clamps, making it compatible with both 1-1/4" and 1-1/2" PVC or ABS discharge pipes. I for sump pump applications, it reliable operation with a flapper style seal and a sturdy ABS body. Model Number: CV01.25/1.5INRB