The gas regulator is designed to regulate the flow of propane from your gas cylinder to your Ooni pizza oven. Please check with your local gas supplier to determine gas pressure requirements. It is essential that you check three things. Match the pressure of the regulator to the pressure of your oven. For example, if you’re in the USA, Ooni pizza ovens are 28mbar, therefore you need a 28mbar gas regulator. The connection on the propane tank to the regulator. There are two types - screw and push-on. The clips for connecting the hose to the oven match.