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The PURWater CUPPLSSLP0002 water filter coupler can be used with the following filter cartridges:
The PURwater Filter Cartridge Coupler - 2.5" Diameter allows you to connect and use two filter cartridges at the same time. Doubling your filtration capacity is easy with this filter coupler, which only works with filters measuring 2.5 inches in diameter.
PURwater Filter Cartridge Coupler - 2.5" Diameter specifications: