Use to remove and install the locking ring of the fuel tank delivery sensor unit. Mercedes: W163, 203, 209, 211, 219 Also see #161020 for BMW. Fits: BMW E31, E34, E36, E38, E39, E46, E52, E53, E60, E61, E63, E64, E65, E66, E67, E83, E85, E87, R50, R52, R53