Poolmaster 13024 Replacement Filter Cartridge for Leisure Bay 100 111791 and M-7418 Filter The corresponding Pleatco number is PLB100 and the corresponding Unicel number is C-7418 The top of the replacement filter cartridge is open 2-15/16 and the bottom is open 2-15/16 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