Pentair 155109 4 Prong T-Nut Replacement Pool and Spa Filter 4 Prong T-nut replacement Fits Pentair Clean & Clear cartridge pool and spa filter models CC 50, CC 75, CC 100, CC 150, CC 200 Also fits Pentair Star Polymeric and Warrior pool and spa D.E. filter models 56408600, 56408700, 56408800 Compatible with Pentair Sand Dollar pool and spa sand filter models SD 35, SD 40, SD 60, SD 70, SD 80 Also compatible with Pentair Star pool and spa D.E. filter models ST 35, ST 50, ST 80