The Pleatco PC-18 R is a compatible replacement for the following spa filters:
The Pleatco PC-18 Comp. Pool Filter Cartridge is a pool and spa filter with an Open 1 1/8" top hole and Open 2 3/8" bottom hole. This compatible Pleatco filter purifies the pool and spa water through the use of 13 square feet of media area. This pool filter cartridge measures 4 3/4" in diameter and 18" in length.