Vapor Return Valve: Also called the vapor equalizing connection or vapor equalization valve, this attribute is necessary on all ASME propane tanks. They are often deployed in case the liquid during the container results in being pretty overheated and need to be evacuated through the container. Do your investigation: There https://buypropanetanks33222.amoblog.com/not-known-facts-about-propane-tanks-near-me-49003316