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The Filbur FC-1910 is the replacement filter for the Pentair Pac Fab 174821 R.
Guaranteed to fit or your money back!
The Pac Fab 174821 Comp. Pool & Spa Filter Cartridge has a diameter of 5 5/16 inches, and a length of 13 9/16 inches. This spa filter cartridge has an open top with a diameter of 2 1/8 inches, and an open bottom with a diameter of 2 inches and Male Pipe Threads (MPT). This pool filter replacement will keep the water in your pool or spa clean and clear.