Before installing a water line for your refrigerator, you need to confirm you have a nearby cold water supply to tap into, the right tubing material for the run, a proper shutoff valve, and a clear path from the supply to the fridge without sharp kinks or obstructions. Getting these details right upfront prevents the two most common outcomes of poorly planned refrigerator water line installations: slow leaks behind the fridge that go unnoticed for months, and inadequate water pressure that produces weak ice or slow-filling dispensers.

Finding a Suitable Water Supply Connection

A refrigerator water line taps into an existing cold water supply line — most commonly under the kitchen sink, in the basement below the kitchen, or from a cold water line inside a nearby cabinet. The closer the connection to the refrigerator, the simpler the installation. The supply line must have adequate pressure — typically between 40 and 120 PSI — to operate the ice maker and water dispenser properly. If your home has low water pressure, that’s worth addressing before adding another appliance to the supply.

In Denver-area homes, water pressure can vary depending on neighborhood elevation and the city’s pressure zones. If you’ve noticed sluggish water flow at other fixtures, have Done’s plumbers check your incoming pressure before the refrigerator line goes in.

Tubing Material: Copper vs. Braided Stainless vs. Plastic

The three common choices for refrigerator supply lines are copper tubing, braided stainless steel flexible lines, and plastic (usually polyethylene) tubing. Copper is the most durable and least likely to fail over time, but it requires soldering or compression fittings and a steady hand to route without kinks. Braided stainless steel lines — the same style used under sinks — are easy to install and resistant to kinking, making them a popular choice for short runs. Plastic tubing is the least expensive option but is also most susceptible to cracking, kinking, and rodent damage, and is generally not preferred for permanent installations.

The refrigerator manufacturer’s installation guide will specify a minimum tubing diameter — most commonly 1/4 inch — so confirm compatibility before purchasing materials.

A Dedicated Shutoff Valve Is Not Optional

Every refrigerator water line should have its own accessible shutoff valve at the supply connection. This lets you shut off water to the refrigerator quickly if the line develops a leak or the ice maker malfunctions, without turning off water to the entire kitchen. Saddle-tap valves — the self-piercing type that clamp onto an existing pipe — are common in older installations but are notorious for leaking over time and are not recommended for new work. A properly teed and valved connection with a dedicated ball valve is the right approach.

Routing the Line Without Kinks or Damage Risk

The path from the supply valve to the refrigerator needs to be planned carefully. Avoid sharp bends that can restrict flow or cause tubing to fatigue and crack over time. When routing through cabinets or walls, use grommets or protective sleeves where the line passes through wood or metal edges. Leave enough slack behind the refrigerator — typically a coiled loop — to pull the fridge out for cleaning or service without straining the connection at either end.

  • Confirm incoming water pressure is adequate (40–120 PSI)
  • Choose a nearby cold water supply line to minimize run length
  • Use copper or braided stainless — avoid saddle-tap valves and plastic for permanent installs
  • Install a dedicated shutoff valve at the supply connection
  • Leave a service loop behind the refrigerator for future access
  • Check the refrigerator manual for required tubing diameter and pressure range

When to Call a Plumber Instead of DIYing

If the nearest supply line is not easily accessible, if the run requires going through walls or floors, or if the existing supply connections are corroded or poorly configured, a licensed plumber will do the job more reliably than a DIY approach. A slow leak behind a refrigerator that goes unnoticed for weeks can cause significant water damage to flooring, subfloor, and cabinetry — the cost of a professional installation is minor compared to the cost of that repair.

Done’s plumbers handle refrigerator water line installation and any associated supply line work throughout the Denver metro. If you’re also dealing with low water pressure, corroded shutoffs, or want to upgrade the kitchen plumbing at the same time, our kitchen and bath plumbing services cover all of it. Visit our pipes and water lines page for more on supply line work.