The Purex 1722840 R is a compatible replacement for the following pool and spa filters:
The Purex 1722840 Comp. Pool & Spa Filter Cartridge has a diameter of 7 inches, and a length of 18 7/16 inches. This Purex pool filter has both an open top and bottom, and each has a diameter of 2 3/8 inches. This pool filter replacement will keep the water in your pool or spa clean and clear.