The quality you expect with the performance you need, so you can enjoy your pool worry-free. Dimensions and specifications of the cartridge. 4 X 115 Sqft of filtration area, media is 4 oz. 3 ID Top and bottom (open hole). 26″ L x 7″ OD x 3 ID. End caps are both open with polyurethane material to provide high impact and perfect seal, our core is injection mold creating more stability than drilled PVC pipe. Entair CCP420, 178584, R173576. Pentair Clean and Clear Plus 420 Cartridge. Cartridge meets OEM specifications. This Package contains 4 cartridges.