Pleatco PMA70-F2M Replacement Cartridge for Master Spas, Top Load Cartridge, 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 9-1/4-by-2-inches MPT with handle Made in the USA