【Compatible Models】：Mamokin 6CH-402 Compatible with PMA40L-F2M, Master Spas Twilight X268365, X268543,X268514, X268511， Unicel 6CH-402,Filbur FC-0317.Fit for pools/spas made by: Down East/Ft. Wayne Spas/Master Spas and other manufacturers/Spa Crest.NOTE: All trademark remain the property of their respective holder(s) and are used for compatibility information only. MAMOKIN is an independent brand. 【Size】：Length: 9-3/8"; Outside Diameter: 6"; Top: Semi-circular handle; Bottom: 2" male thread/MPT.Please check your Models and Size before Purchase! 【Premier Performance】：Mamokin filter premier performance,brings you safe,clear purified water and your unique SPA time. 【Easy cleaning】：The Improved Trilobal Fabric Filter Structure makes it easier to wash/clean to repair the filter.For better use experience and effect, it is recommended to clean it every two weeks. 【Long service time】：The filter designs to well extend the service life and keep pollutants away from clean water. The filter life exceeds 1 year based on normal wear. Mamokin 6CH-402 Spa filter-2 PACK