Its the plastic (Alloy on older models) Nut that holds in the fuel level sensor up in to the Tank on a Monster. I've managed to split mine. Tried various avenues to try and get one. Dont really want to have to go buying the whole new unit just for a Nut. So if anyones got a Monster tank sitting around with the level sensor on id be happy to send some Shillings your way
[Edited on 18-9-2005 by Mr C]