External water tap thread size
hi guys I have an external water tap which I am looking to fit a standard modern size screw in hose fitting. But the tap I have seems to be some what smaller, i have looked for an adaptor but I don't know what size my tap is to get the correct adaptor, I also don't know how to measure it. I have posted a pic below it says BS 33 on the side.
Any help would be much appreciated.