Poolmaster 12717 Replacement Filter Cartridge for Jacuzzi Premium J-300, J400 6540-476 Filter The corresponding Pleatco number is PJW60TL-F2S and the corresponding Unicel number is 6CH-960 The top of the replacement filter cartridge is semi-circle handle and the bottom is 2 male thread SAE 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