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The Rainbow 17-2021 R is a compatible replacement for the following pool and spa filters:
The Rainbow 17-2021 Comp Pool & Spa Replacement Filter has a diameter of 2 7/8 inches, and a length of 19 1/2 inches. This spa filter has both an open top and bottom, and each has a diameter of 1 1/16 inches. This pool filter replacement will keep the water in your pool or spa clean and clear.