2 PACK Hayward CX1100RE, Unicel C-8610, Pleatco PA100, Aladdin 19905, Filbur FC-1290, Star Clear II C-1100 ALL AMERICAN CARTRIDGE 8005 Swimming Pool Replacement Cartridge PLEASE DOUBLE CHECK ... DOES YOUR CARTRIDGE MATCH THESE MEASUREMENTS ??? LENGTH: 23 3/8 inches .. OUTER DIAMETER: 8 1/2 inches ... INNER DIAMETER: 4 1/16 inches // 4 oz...100 square feet ... 154 pleats Replacement Cartridge fits: Hayward CX1100RE, Pleatco PA100, Unicel C-8610, Aladdin 19905 MADE IN THE USA! When you make a purchase, you're supporting a small business with the entrepreneurial spirit that made America great!