Truma leaking hot water overflowing

[Gunn Manor]

thanks Lenny HB ordered one, hope arrives by tuesday.
i refitted the existing one, all seals looked ok, couldnt see the valve which is probably the problem, and still getting small leak.

i ordered one of the above joints, its a little different from the original, has a larger joint for the metal pipe out of the boiler, just make sure it is seated properly and super tight. i used a fuel pipe clamp rather than the existing one, this has given a better seal on the hot water flexible pipe. refilled and hot water an heating on and being tested, so far so good.... fingers crossed this solves the problem.
thanks for the info.