Poolmaster 12060 Replacement Filter Cartridge for Coleco F-120 Type "A" 58600 and 59900 Filter Equivalent to the following replacement filter cartridges; Pleatco PC7-120 and Unicel C-4607 The top of the replacement filter cartridge is open 1-15/16 and the bottom is open 1-15/16 Break-resistant bands keep pleats separated for greater flow, filtration and add longer life to cartridge High quality spun bonded polyester material for exceptional water filtration Premium grade polyurethane and plastisol end caps