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The Rainbow 17-0051 R is a compatible replacement for the following spa filter cartridges:
The Rainbow 17-0051 Comp. Pool & Spa Cartridge Filter is a spa filter replacement useful for the improvement of swimming pool and spa water quality. Utilizing 15 square feet of media area, this compatible Rainbow filter measures 2 7/8" in diameter x 17 1/16" in length with 1 1/16" Open top & bottom holes.