Aladdin 20201SVP-8 Replacement Filter Cartridge for a Sta-Rite Posi-Flo 100, Posi-Flo II PTM 100, WC108-58S2X Filter media made from 100% Spun bond Polyester for clarity, clean ability and long life Strong PVC 160 PSI core High impact end caps with antifungal biocide added Stretch and break resistant pleat bands Made in the USA This is a Aladdin replacement part Part Number 20201SVP-8 This is an aftermarket of generic part