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This Pentek 155003 Cartridge Coupler is a reusable water filter accessory utilized with double open end standard diameter water filters that enhances their effectiveness and extends their length by allowing you to connect and use two filter cartridges at the same time which doubles filtration capacity.
The two filter cartridges which are used with this Pentek coupler should be approximately 2 1/2" in diameter (standard diameter filters). The Pentek cartridge coupler works with all brands of standard sized water filters including Pentek filters, Ametek filters, Culligan filters, Bruner filters, Kleen-Plus filters, Plymouth filters, American Plumber filters, US Filter filters, and all other standard diameter water filters.
This Pentek filter cartridge coupler is also known by Pentek part number SH155003 as well as by American Plumber part number 155003.