Poolmaster 13180 Replacement Filter Cartridge for XStream 150 CC-1500 CCX1500RE Filter Equivalent to the following replacement filter cartridges; Pleatco PXST150 and Unicel C-8316 The top of the replacement filter cartridge is open 4 molded gasket and the bottom is open 4 molded gasket 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