Pleatco PMS8 Replacement Cartridge for Muskin 8, Sears, Haugh Products, 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 8-by-2-3/16-by-2-3/16-inches Made in the USA