GA1-BN Drinking Water RO Faucet for Kitchen Sink, Heavy-Duty Lead-Free Reverse Osmosis Faucet for RO Water Filtration System, Non-Air Gap 100% Stainless Steel RO Faucet, Brushed Nickel Finish

Step 1: Make sure your countertop has an existing hole with a diameter between 0.5 to 2.0 inches. Slide the front plate onto the faucet stem, followed by the rubber washer. Insert the stem into the hole on the countertop.

Step 2: Under the sink, slide on the back rubber washer and tight the wing nut. If needed, you may apply a few rounds of plumbers tape to the threads to get a better grip.

Step 3: Slide the push-in fitting up the push-in adapter on the base stem of the faucet and lock it in place by sliding the blue clip under the collet.

Step 4: Insert your water tubing (not included) about 1/2 inch into the push fitting, and secure it with the blue clip. Connect the water and inspect carefully for any leaks.