Abstract: A piping system for adding fuel to underground storage tanks includes a fill piping system and a vapor return piping system designed to prevent fuel spills and leakage of fuel vapors into the atmosphere. Fuel and vapor leakage are avoided by eliminating most of the threaded joints in each such piping assemblies by welding them into joint-free unitary stainless steel assemblies. A brace bar extends between the fill and vapor return piping systems and is secured to octagonal side flats on both assemblies such that the octagonal members cannot rotate unless the brace bar is removed. Annular synthetic rubber spill buckets are selectively inserted into each piping system to catch spills and prevent fuel from leaking near the tank or vapor from leaking out of the vapor recovery system into the atmosphere. In another modification, the spill bucket is used only on the fill piping system.