Patent ID: 6971419

Claim:
In a piping system for an underground storage tank from a fill adapter on the surface including a fuel conduit extending from the tank to said fill adapter, said fuel conduit including a riser pipe and a connector tube; the connector tube comprising a generally circular tube, a threaded connector having at least one exterior flat, said tube and a generally annular standard fill connector permanently secured to the opposite end of said tube, said fill connector, said connector tube and said threaded connector comprising a unitary assembly; a vapor return conduit connected to said tank, said vapor return conduit including a second connector tube having a threaded connector with at least one exterior flat on said second connector tube; and a brace bar extending from said connector tube to said second connector tube and means for securing said brace bar against the flats of said connector tubes, whereby said connector tube may not be inadvertently disengaged or loosened during fueling operation.