Pentair 190030 Drain Plug Cap Assembly Replacement Pool and Spa Filter Drain plug cap assembly replacement Fits Pentair Clean & Clear Plus cartridge pool and spa filters Also fits Pentair FNS Plus, Quad pool and spa D.E. filter models FNSP24, FNSP36, FNSP48, FNSP60 Measures 2-1/2-inch length by 3-inch height by 2-1/2-inch width