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We are an authorized Unicel dealer!50 Sq FtLength: 12 1/2"Outside Diameter: 5 3/16"Top Hole: Bar HandleBottom Hole: 2" Male Thread/MPTWorks in Marquis spas 20041 and 370 0237MADE IN THE USA!Unicel replacement filter grids are recognized as the best grid replacements in the industry. They have received numerous awards year after year for their performance and quality of products. We are an Authorized Unicel Dealer. An appropriate cleaning schedule will both help the performance of the filter and keep it from breaking for longer periods of time. However, it is not a permanent part and standard use will result in the need for a replacement. Make sure you go with the highest quality standard of replacement: Unicel.