What Adapter For

What size is an ice maker water line?

Ice maker lines are 1/4" compression at both ends, so the shutoff valve needs a 1/4" outlet. The usual 3/8" sink or toilet valve outlet is the wrong size.

What fits

A shutoff valve with a 1/4" outlet, plus a 1/4" ice maker line

On the package: Valve outlet 1/4 in. O.D. Comp; line 1/4 in. Comp x 1/4 in. Comp

ice maker lines are 1/4" compression at both ends

Available on Amazon

1/4" ice maker supply line

As an Amazon Associate, What Adapter For earns from qualifying purchases.

  • Turn the water off at the shutoff valve first. When the line is on, turn the water back on slowly and check both ends for leaks.
  • BrassCraft’s ice maker lines are 1/4" compression x 1/4" compression, 12" to 120" long, for ice makers and humidifiers.
  • So the valve needs a 1/4" O.D. compression outlet. BrassCraft makes angle stops with 1/4" O.D. outlets.
  • No tape or sealant. These lines seal with built-in washers.

A 3/8" sink or toilet valve outlet is the wrong size for a 1/4" ice maker line.

More: Supply line sizes

Keep going

Dishwasher water lineFaucet supply line sizeShutoff valve for copper pipeGarden hose to 1/2" pipeGarden hose to 3/4" pipeConnect two garden hosesGarden hose to drip irrigation

For a different part on either end, open the adapter finder with this pair picked.

Where we get our information from

The sizes on this page come from published standards and the makers’ own documents. Checked against published data from BrassCraft and Fluidmaster.

See all 4 sources
  • BrassCraft, angle stop product pages (compression, FIP, sweat, PEX and push-connect inlets; 3/8", 7/16", 1/2" and 1/4" O.D. outlets; 1/2" nominal = 5/8" O.D.)
  • Fluidmaster, faucet and toilet connector catalogs and Click Seal pages (FM91429, FM91233)
  • BrassCraft, dishwasher (B1-DW, B1-60DW1) and ice maker (B0-IM) connectors
  • BrassCraft, installation instructions for connectors (425.10, 425.07, B0120IMB) and water supply stops (425.04)

General guidance from manufacturer and standards data. Parts vary by brand, so check the size printed on the package against what you measured. For gas lines or anything inside a wall, use a licensed plumber.