Easy does it if you decide to go down that route.......I use a step drill after a pilot hole to get to the correct size of hole that suits the grommet.Since been looking around and found pipe with grommet and filter so I think I will but it an open up the hole in the tank a touch to accept the grommet.
I had the same thoughts John but would only expanded the hole as a very last resort as a replacement tank could prove difficult or expensive.Easy does it if you decide to go down that route.......I use a step drill after a pilot hole to get to the correct size of hole that suits the grommet.
John
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