4 Guardian Pool Spa Filter Replaces PA100N, Unicel: C-7487, Filbur: FC-1270, CX870-XRE, C4000 Hayward Replaces Pleatco PA100N | Unicel C-7487 | Filbur FC-1270 Diameter: 7", Length: 25-1/2", Top: Open Hole 3", Bottom: Open Hole 3" Filter Area: 100 sq ft Filter Material: Reemay (4 oz/yard) Used in Hayward pools/spas