Made with high quality filtration media that was made specifically for durability and cleanability. Includes support bands around each cartridge element. Replaces OEM# R0554500, A0557900, CL 340, CL340 Unicel# C-7459, C-7459R, C-7459-4, Pleatco# PJAN85, PJAN85-M, PJAN85-PAK4, Filbur# FC-0800, FC-6405, Aladdin# 18504. Length: 27″, Outside Diameter: 7″, Inside Diameter 3. Used with Jandy CL340 Cartridge Filter (CL 340) and CV 340. NOTE: This is a compatible aftermarket replacement part. The manufacturers’ names and part numbers have been used for reference purposes only. Optimum Pool Technologies Inc is an independent brand.