Unicel C-5399 Replacement Filter Cartridge for 100 Square Foot Seasonmaster, Model 141 before 1994 Diameter: 5 7/8-inch; length: 25 3/4-inch Top end cap: semi-circular handle, 0-inch inner diameter; bottom end cap: male slip fitting with molded o-ring, 0-inch inner diameter Pleat count: 160; filter media: 3-ounce reemay 2033; filter area: 100 square feet Get more efficient filtration and better water clarity with Unicel filters Longer time between cleanings; meets oem specifications