Ah yes well looks like i'm going to have to sort out a way to redrill my tank then. The holes it came with are only 25mm/1" but from what I have read you need a 45mm/1 3/4" hole for a 1" bulkhead
. They have them at my local hardware store just they are threaded not double slip.
Edit: Tanks are at my not so lfs
and are being drilled for the 1" bulkhead
hopefully have everything set up by the weekend