I have a rubber grommet (same as speedo grommet) that I'll install around the petcock supply tube in the floor of the truck. I just left it off after installing the new tank so I could keep a close watch on the connection and the outlet flange. I'll install it later on after I'm confident that the new tank and flange connection is OK.

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)