Pleatco Replacement for Sta-Rite Posi-Flo II PTM70, T-70TX, T-70TXR, 70GPM-TX, 70TX, 70TXR, Open with 12 Concentric Slots, 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 18-3/16-by-4-3/16-by-4-3/16-inches Made in the USA