Prochef 8123-B gives you the possibility to regulate and shut off the gas to the appliance at its source through the "ON-OFF" shut-off value, for maximum safety especially when the gas supply is being tested at high pressure. The device has been set at the factory to work on LP or natural gas and should not be converted by the user. This type of conversion should be done only by a factory-trained technician. In case of escaping gas from the LP gas cylinder, you should get away from the tank and call your fire department.