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The Rainbow 174819 R is a compatible replacement for the following spa filters:
The Rainbow Plastics 174819 Comp Pool Filter Cartridge is a spa filter replacement manufactured with quality filter media and 5 square feet of area for the reduction of unwanted contaminants in swimming pool/spa water. This compatible Rainbow filter has dimensions of 2 7/8" in diameter x 9 3/4" in length with 1 1/16" Open top/bottom holes.