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Install the Cold Water Supply Fitting — Disconnect the Water Supply Line

Beginner

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How to Remove an Old Dishwasher · Step 3 of 6

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In this video

First, shut off the cold water supply by turning the shut-off valve. Relieve pressure by opening the main kitchen faucet until the water stops running. Unscrew the existing flexible cold water supply line from the shut-off valve. Attach the provided cold water supply fitting (T-fitting) to the shut-off valve. Then, reconnect the kitchen faucet's cold water line to the top of the new fitting. Gently tighten the connections. Finally, push the green tubing from the RO kit firmly into the quick-connect port on the side of the supply fitting until it stops.

Goal: Tap into the cold water line to supply the RO system

  • Avoid leaks by making sure your tubing is connected securely. Always push the tubing into the fitting until it engages with the o-ring and hits the back of the fitting.

Used in this video

  • Adjustable Wrench — Tightening plumbing connections.
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FAQs

What are the absolute most critical safety steps I need to take before starting this project?

Before anything else, locate and shut off the electrical breaker dedicated to your dishwasher, and turn off the hot water supply valve, usually found under the sink. Verify both are off before touching any wires or hoses to prevent electric shock or water damage.

What specific tools from the list are absolutely essential for a beginner, and are there common alternatives?

You definitely need a Phillips head screwdriver, an adjustable wrench, and a bucket for drips. While specialized tools can help, these three will handle most disconnections. Ensure your screwdriver fits snugly and your wrench isn't stripped.

How difficult is this project for someone with no prior plumbing experience, and how long should it realistically take?

This is considered a beginner-friendly project, primarily involving disconnection. For a first-timer, plan for 1.5 to 2.5 hours, allowing extra time for identifying connections, stubborn fasteners, and safely managing any water spills.

I'm concerned about water leaking everywhere when I disconnect the hoses. How much water should I expect, and how do I minimize the mess?

Expect some residual water (1-2 cups) from the supply line and the dishwasher's sump. Place towels and a bucket directly under the connections before loosening them. Work quickly and have extra absorbent towels, like the WYPALL L40, ready.

Transcript
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hole in our granite countertop which we'll use. The cold water supply fitting sends the water to the RO filter assembly and is much easier to install than it seems. First, close the cold water shutoff valve. Make sure no water continues to flow by turning on the sink faucet until it runs completely dry. Next, unscrew the existing supply line from the shutoff valve. Attach one end of the supply fitting to the shutoff valve and then attach the cold water supply line to the other end, like this. Gently tighten all of the connections, but don't over tighten them. Finally, attach the green tubing from your RO unit to the remaining connection point by pushing it into the fitting until it stops, seats. You should feel the tubing stop, then pull firmly on the tube to ensure it's secure. The other end will eventually connect to the RO system.

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