Hi there I noticed our toilet overflow connector pipe at the bottom of the cistern (see attached pic) was dripping when the overflow was in action. I think this has pretty much always been the case since the chap fitted it some years ago - obviously only happens when its overflowing into the internal pipe. Anyway the leak occurs at the bottom of the white plastic nut. I have not yet undone it all to inspect, I did try tightening the nut a bit and testing the overflow which seems like it was then a bit worse! The question I have though - simple plumbing question - is that to my mind the grey pipe at the bottom must be of a smaller diameter than the white pipe it is trying to connect to - so what would stop the water just dribbling out of the bottom of the nut - as it is - presumably some sort of washer in the bottom of the nut? I have tried wiping some grease around it to see if that helps things but at some point will undo the nut and have a look. Thanks in advance for any advice here.