Pleatco PA120 Replacement Cartridge for Hayward Star-Clear Plus C-1200, 1 Cartridge Replacement filter for pool and spa cleaning systems 50% open ABS free flow cores maximize water flow through REEMAY filter media Antimicrobial end caps resist chlorine degradation and provide support to filter material for a longer life span Length 23 1/4", Outer Diameter 8 15/16", Top Hole & Bottom Hole 4" Replaces Unicel C-8412 and Filbur FC-1293 Made in the USA