- 1). Determine the regulator sufficient for your gas-powered appliance. When purchasing a Donkin regulator, make sure it conforms not only to the specifications of the appliance, but of the gas service provider as well. If the appliance is a stove or gas grill, it should only require a single-stage regulator, since it operates for short durations. For a water heater or furnace, a two-stage regulator is recommended.
- 2). Turn off the gas flow from the source, either by closing the valve on the tank, or shutting down the gas main. Most stoves have a petcock to close the gas off at the appliance. However, closing it at the main is the safer step.
- 3). Wrap the threads on both lines connecting to the regulator with Teflon tape. This helps prevent leaks.
- 4). Connect the incoming gas line to the regulator input. Gas flow is indicated on the regulator body. The gas-line threads screw into the regulator. Tighten this connection with an adjustable wrench.
- 5). Screw the appliance gas line into the regulator. Connect the two in the same manner as the gas input line.
- 6). Turn on the gas and listen for leaks. If any are found, tighten the fittings further.
Source...