Pleatco PRB14.5 Replacement Cartridge for Rainbow Hi Flow 14.5, 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 17-1/16-by-1-1/16-by-1-1/16-inches Made in the USA