Flexible Supply Lines

Simplifies installation of toilets, faucets, water heaters and more.

Flexible Supply Lines - Buying Guide

Flexible supply lines bring water and gas from the permanently installed pipes behind your walls to your fixtures and appliances.

Tip: Always turn off the gas or water before working on supply lines and turn water back on slowly to check connection for leaks.

Type of Supply Line

Follow these steps to determine the supply line you need:  

  • Measure the distance between the appliance and the gas supply and add three inches to be sure it’s long enough.
  • Refer to the manufacturer’s label on the appliance to identify the maximum gas input rating.
  • Select a flexible supply line with a maximum flow rating capacity higher than the appliance’s input rating.
  • Select the supply line with the connectors that match the appliance’s gas shut-off valve and inlet.

Gas Supply Materials

Gas supply are usually used for clothes dryers, water heaters, gas ranges and fireplaces, and they are usually made out of copper or braided stainless steel covered with a sturdy plastic coating.

Gas Supply Connectors

Typically measured by outer diameter, which is designated as “OD” on packaging. Common examples include:

  • Dryers – 3/8” stubout MIP
  • Water Heaters – ½” FIP inlet
  • Gas Ranges – ½” FIP inlet
  • Gas Fireplaces – 3/8” stubout MIP or 3/8” flare fitting

Water Supply Line Materials

May be made of copper, but most are made of plastic, braided plastic or braided stainless steel. Research local regulations because some areas do not allow braided plastic supply lines.

Water Supply Connectors

To select the right connector, follow these steps:

  • Determine the length you need by measuring from the inlet valve to the fixture, then add 4” to make sure it’s long enough.
  • Select the connector size. Refer to the chart below as a general guide.
Fixture Connector at Fixture Connector at Shut-Off Valve


3/8" male pipe

1/2" or 3/8" compression


1/2" female pipe

1/2" or 3/8" female compression or sweat


1/4" female compression

1/4" female compression


7/8" ballcock

1/2" or 3/8" female compression or sweat

Washing Machine

3/4" hose thread

3/4" hose thread


Refer to the following designations on the packaging and labels to select the supply line you need:

  • NPT (National Pipe Tapered Threads). Industry standard for tapered threads used to join pipes and fittings.
  • FPT or FIP (Female Pipe Thread). Female threaded fitting with the threads on the inside.
  • MPT or MIP (Male Pipe Thread). Male threaded fitting with threading on the outside.
  • Compression. Fitting that attaches to a standard compression thread on the valve.


  • Water Hammer Arresters. Also known as mufflers. Stops the banging sound you hear when valves on washing machines, dishwashers and faucets slam shut. Also prevents damage to pipes and faucets.
  • Corrosion Resistance. Built-in protection against corrosion.
  • Deep Corrugation. Provides greater flexibility.
  • No-Burst Hoses. Reinforced with stainless steel braiding.
  • Right-Angle Connectors. Ideal for installing a supply line in tight areas without kinks or breaks.

Product Innovations

FloodSafe™ Connectors ensure proper pipe fit and operation and automatically shut off when a preset specified water flow amount has been exceeded. Protects homes from water damage.