While the Natural Gas versions of Twin Eagles gas grills come with this regulator attached to the end of the manifold, the Liquid Propane models come with a hose and regulator for a 20lb. tank. This regulator is used for replacement in either a Natural Gas grill that requires a replacement, or on Liquid Propane models that are being used in the instance where they are being built into an outdoor cooking island and running off of bulk gas supply from the house.