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Give it purpose - fill it with water filters, air filters, refrigerator filters, and more.
The Filbur FC-3840 is the replacement filter for the Muskin A3821 R.
Guaranteed to fit or your money back!
The Muskin Pools A3821 Comp. Replacement Filter is a spa filter cartridge that measures 6 1/4" in diameter x 8" in length with 2 3/8" Open top & bottom styles. Featuring 20 square feet of media area, this compatible Muskin Spas filter purifies swimming pool & spa water.