The Coaxial Fill Tube allows for bottom filling of underground storage tanks in single point Stage I vapor recovery applications. The tube is designed to allow vapors to return to the transport tanker, while filling the UST from the same point. The fill tube slips easily into the existing fill riser pipe on the storage tank, Welded tabs keep the tube centered and allows the tube to be secured in place with PEMCO Model 251 Coaxial Adaptor. The fill tube features an aluminum body and includes a Buna-N gasket.