Pentair 191474 O-Ring Replacement Pool/Spa Filter and Skimmers O-ring replacement Fits Pentair Star polymeric, Star and FNS Plus pool/spa D.E. filter models FNSP24, FNSP36, FNSP48, FNSP60 Also fits Pentair Clean & Clear Plus pool and spa cartridge filters Compatible with Pentair Bermuda gunite and vinyl liner skimmers Measures 6-inch length by 1/2-inch height by 4-inch width