Check the # of water line attached to your current faucet on the underside. If more than one water line is attached, you need an "air-gap" style faucet. If only one water line, then you need a regular "non air-gap" style faucet. Here is our selection of faucets:
Faucets for Reverse Osmosis Systems and Drinking Water Spigots for Under Sink Water Filters.
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WaterFilters.NET