Filters, Replacement Cartridges

 This filter is 13 1/2" X 4 15/16" and has a female SAE Large Thick Thread that is 2" which would really nmeassure about 2 1/4-2 3/8" ID. This filter is found in Four Winds Tubs, Barefoot and others. If you have the shorter verison of this filter...

This filter is 9 3/4" Tall x 4 5/8" Wide and is closed on the top and has a 1 1/2" mpt thin threaded nipple that measures about 1 13/16" across the threads. This filter fits some of the Jacuzzi Whirlpool hot tubs that are found under the names Jacuzzi...

This Filter Cartridge fits Some New Cal Spa and Marquis Spas. It is 12 1/2" Tall x 5 3/16" Wide with 2" Mpt Threads which is a think thread that measures about 2 3/8" outside diameter. The MPT Threads measure between 2 1/4 and 2 3/8" edge to edge. It...

This Filter is a 40 Square Foot Filter Cartridge that is 6" Outside Diameter x 8 1/4" in Length. It has a 1 1/2" SAE Threaded Fitting which is a Thick Thread that measures about 2" outside diameter of the threads. SAE Threads are really thick. This...

This filter is this most popular size and fits 70% of all tubs it is a 50 Square Foot Filter Cartridge that is 4-15/16" Outside Diameter x 13-5/16" in Length. It has a hole in the top and the bottom that are 2 1/8". Don't just order this filter though...