Pleatco PSD65-2 Replacement Cartridge for Sundance 65; 2-5/8-inch I.D., 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 14-3/4-by-2-5/8-inches with castle top Made in the USA