Poolmaster 12859 Replacement Filter Cartridge for Caldera 75 033017 Filter The corresponding Pleatco number is PCD75 and the corresponding Unicel number is C-7479 The top of the replacement filter cartridge is semi-circle handle and the bottom is 2 male slip fitting 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