Pleatco changed design in 2010 - this cartridge does not have threaded bottom base - Use #4-05-0362 if require threadsOD: 4-5/8”Length: 8”Btm ID: 1.90” (no threads)Top ID: posi grip handleReplacement option:Unicel 4CH-21Filbur FC-0121Manufacturer: AlcoveLimited to stock on hand Brand name : Pleatco
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