Pleatco PRB75 Replacement Cartridge for Dynamic Series V-DSC-75, Series II and III RTL/RCF-75, Custom Molded 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 20-1/8-by-2-1/8-by-2-1/8-inches Made in the USA