Waterway 711-4010B 2-Inch Tailpiece Gasket Replacement for Select Waterway Pool and Spa Filters/Pumps Union gasket replacement Fits Waterway Hi-Flo side discharge pump, CSA hi-flo side discharge pump, workman pump Also compatible with Waterway Clearwater D.E. filter, Clearwater cartridge filter, carefree sand filter and Clearwater sand filter Measures 2-inch size