Thanks for responses. We have glued the aluminium shaft to the plastic that goes thru the sink and the tap sits on top of that. So we will see how that goes.
We were concerned that we had the same problem ,in the same place, with 2 taps. But checking on forums it doesn't seem to be a huge problem out there. Maybe we are just unlucky!!
Had a similar problem with last van and discovered that where they join is a slide on fit as the water supply is very low pressure and over time with the hand pump being operated the aluminium tube worked loose I pushed it home and applied silastic after it came loose a second time and it never leaked again its also important to keep it tight where it comes through the bench top as this reduces chances of it working loose due to operating pump handle
__________________
Life was meant to be enjoyed Australia was meant to be explored
Happily doing both to the Max.
Life is like a camera, focus on what's important & you will capture it every Time