Designed to provide a positive shut-off during a pressurized fill delivery on an aboveground storage tank, EBW Warden OPV eliminates spills and overfills, avoiding costly cleanup expenses and ground contamination. The Warden is fully adjustable to provide shut-off in various height and capacity aboveground tanks. It is designed to fit into a 4″ fill riser, making installation on new and existing locations simple and quick.