Poolmaster 12887 Replacement Filter Cartridge for Coleman/Maxx Spas Filter The corresponding Pleatco number is PC575N and the corresponding Unicel number is C-8475 The top of the replacement filter cartridge is open 2-1/8 and the bottom is open 2 lip 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