This is a Vexca PA100N Pool Filter Cartridges Compatible Unicel C-7487 C4000 C4020 4 PACK. It is new in box. Free shipping from US seller.
Compatible with Unicel C-7487, Filbur FC-1270, Hayward CX870RE, CX870-XRE, Hayward C4000, C4020, C4000S.
Length: 25 1/2"; Outside Diameter: 7"; Top: 3" opening; Bottom: 3" opening; Filtration Area: 100 sq.ft; Filter Material: Trilobal Filtration Fabric.