Pleatco PBH50 Replacement Cartridge for Baker Hydro HM 50, 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 19-5/8-by-2-inches Black Slip Fitting with swivel handle Made in the USA