The Bullfinch external mains point is used by a couple of caravan manufacturers including Swift Group. I have found on my caravan that the plastic body has cracked. Apparently my dealer informed me it is a very common occurrence with this unit and the result is that it allows water to enter the caravan. The flap on these is opened by pressing the centre and it can be quite difficult to open. Later units I am told have been modified to cure this problem.