Only on steel and possibly modern twin wall tanks, on single skin plastic tanks you have to drill your own 30mm hole and screw the outlet down onto the gasket supplied.You do know you have to use a pre made outlet eg bsp boss which normally are only under the lid / hatch ? You can’t drill your own
See here, think I have posted this before: Fitting The Atkinson Tanktop - https://www.fueldump.co.uk/2011/12/02/fitting-the-atkinson-tanktop/
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