Vapor Return Valve: Generally known as the vapor equalizing relationship or vapor equalization valve, this attribute is required on all ASME propane tanks. They are usually deployed in case the liquid during the container turns into quite overheated and need to be evacuated within the container. Get a Estimate Click https://1000-gallon-above-ground91222.glifeblog.com/26808332/details-fiction-and-57-gallon-vertical-propane-tank