Darlly 81004 FC 3965 C 8399 PC 3965 Spa Pool Filter Cartridge handrailsladders and this OEM Jacuzzi and and this OEM Jacuzzi and Carvin basket is designed for compatible PMT series skimmer applications where the original basket has cracked A properly selected replacement helps preserve the intended internal flow relationship and support structure instead of forcing the repair to rely on a substitute that only partly fits A cartridge like this is useful because it restores filter performance while matching the original shorter body cartridge design required by the housing This Darlly replacement is especially useful when the original 100 square foot filter element with 3 5 8 inch bottom opening and 8 inch body needs renewal