This is an authentic OEM part from Briggs and Stratton and Snapper for use with Generators. The fuel tank mounting grommet forms a cushion between the fuel tank and the fuel tank mounting bolts. The most common reasons for replacing the grommet is if the fuel is leaking from the fuel tank, the fuel lines are loose at the tank or the rubbe...Read morer grommet is cracked and not sealing. This part is made out of rubber and is sold individually. Here is a list of tools that are needed to replace the grommet a receptacle for draining fuel, a wire hook (to retrieve fuel lines), screwdriver, wire cutters or scissors.