Mac Mac in work we use a plastic syphon pump.
Long tube sits right into the barrel and you have a hose coming off it with hand pump to pump it into anything you want.
I can ask the valeters in work where/much they can be got?
Yeah they do, I bought a lovely flexi one a few years back for the metal Gerry cans.
Has the rubber seal and clamp on it.
Proper job and fits all Gerry cans.
No have that too! It's the sh*t one.
The one I got off them
Is a metal flexi one which is perfect for filling the tank on any car with the can full.
It allows you to hold a full can at normal height while filling if your not arnie!!