The CRAFTSMAN 1-1/2 in. x 1-1/4 in. sump pump application check valve is a critical component in the installation of any sump pump. When properly installed, our check valve prevents water from flowing back into the sump pit, which minimizes the sump pump's short cycling. This sump category accessory is constructed with durable ABS plastic, flexible rubber, and corrosion-resistant stainless steel, ensuring years of reliable use. CRAFTSMAN manufactures with quality in mind and is backed by a 1-year limited warranty.