4 PACK Hayward CX870XRE, Super Star Clear 4000 ALL AMERICAN Replacement Filter Cartridges, Unicel C-7487, Pleatco PA100N, Filbur FC-1270 Swimming Pool Filter Cartridges Please Double Check ... Does Your Cartridge Match These Measurements ??? Length: 25 1/2 inches ... Outer Diameter: 7 inches ... Inner Diameter: 3 inches // 4X100 square feet ... 164 PLEATS MADE IN THE USA Replacement Cartridge fits: Hayward CX870RE, Super Star Clear 4000, Unicel C-7487 Pleatco PA100N, Filbur FC-1270, Aladdin 19902