how to connect two propane tanks together

Connecting two propane tanks together can be done safely for specific purposes, such as increasing the available propane capacity or for backup storage. To connect two propane tanks together, follow these steps:

Note: This process assumes you are connecting two standard propane tanks commonly used for grills and other small appliances. Always prioritize safety and adhere to local regulations when working with propane.

Materials Needed:

  • Two propane tanks
  • Propane regulator with a dual-tank or tee fitting (also called a “pigtail”)
  • Pipe wrench or adjustable wrench
  • Propane hose with proper fittings
  • Leak detection solution (soapy water)


  1. Safety First:
    • Ensure you are in a well-ventilated outdoor area away from open flames, sparks, or any sources of ignition.
    • Wear safety goggles and gloves to protect your eyes and hands.
  2. Shut Off Valves:
    • Close the valve on both propane tanks by turning them clockwise until they are tightly closed. Ensure the tank valves are in the OFF position.
  3. Release Pressure:
    • To remove any residual pressure in the propane lines, open one of the propane tank valves for a brief moment and then close it again. This will release any remaining gas.
  4. Inspect the Tanks:
    • Examine both propane tanks for signs of damage, corrosion, or leaks. If either tank appears damaged or has visible issues, do not proceed.
  5. Connect the Dual-Tank Regulator:
    • Attach the dual-tank regulator (tee fitting) to the two propane tanks. Use a pipe wrench or adjustable wrench to ensure a tight connection. Screw the regulator onto the tank valves in a clockwise direction.
  6. Connect the Propane Hose:
    • Attach one end of the propane hose to the outlet on the dual-tank regulator. Tighten the fitting securely.
  7. Connect to the Appliance or System:
    • Connect the other end of the propane hose to the appliance or system you intend to use. Ensure that the appliance is designed to handle propane from multiple tanks.
  8. Leak Test:
    • Mix a solution of soapy water (water with a few drops of liquid dish soap) in a spray bottle.
    • Spray the solution onto all connections and fittings, including where the propane hose meets the tank valves and where it connects to the appliance.
    • Look for bubbles. If you see bubbles forming, it indicates a propane leak.
    • If a leak is detected, immediately shut off the propane supply, disconnect all connections, and fix the issue before proceeding.
  9. Open the Valves:
    • Slowly open the valve on one of the propane tanks. Do not open it fully initially.
    • Check for any leaks again with the soapy water solution.
    • If there are no leaks, fully open the valve on the first tank.
    • Repeat the process for the second tank.
  10. Monitor Tank Levels:
    • Keep an eye on the tank levels and switch to the other tank when one is empty. This can typically be done using a manual switch or indicator on the dual-tank regulator.
  11. Shutting Down:
    • When you’re finished using the propane or need to disconnect the tanks, close the valves on both tanks before disconnecting any hoses or fittings.

Remember to follow all local safety regulations and guidelines when working with propane, and always prioritize safety during the setup, use, and maintenance of propane systems. If you are uncertain about any aspect of connecting propane tanks together, consider consulting a professional propane service technician for assistance.

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