Klunkless Check Value - Easy Installation on your existing Sump System, The klunkless check valve has a large silencing air chamber that absorbs the sound of the returning water and reduces the noise when the pump stops.Fits 1-1/2 " &1-1/4 pipe, in excellent condition, $$$SAVE$$$ OUR Price:$16..00 As pictured. stk#(2980)Ax,bx