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The Filbur FC-3810 is the replacement filter for the Muskin A3818 R.
Guaranteed to fit or your money back!
The Muskin Pools A3818 Comp. Pool & Spa Filter has a diameter of 4 5/8 inches, and a length of 8 inches. This spa filter has both an open top and bottom, with both having a diameter of 2 3/8 inches. This pool filter cartridge will keep the water in your pool or spa clean and clear.