http://www.waterfilters.net/Waterpik-R-2C-InstaPure-Faucet-Water-Filter.html
The R-2C is the replacement water filter cartridge for the Teledyne Waterpik F-2, F-2C, F-6, and F-52 faucet mount water filter systems. The Teledyne Waterpik R-2C produces healthier, better-tasting drinking water by reducing chlorine and sediment. Also known as R2C, R2, R-2, R-2CT, R-2C4
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