I have a small leak in my hot water cylinder, where the upper end of the
indirect coil emerges. This appears to have a 1" BSP male thread with a
fibre washer and thin backnut to seal it to the tank. The fibre washer
appears to have got *spread*
- probably when it was first made - and there
has long been evidence of slight seapage. However, this has got worse since
I disturbed the surrounding pipework for an unrelated cause.
It's all very difficult to get at due to the integral foam jacket (a little
of which I have cut away) and the 1" to 22mm reducing fitting which is very
close to the backnut.
If at all possible I want to fix it without any dismantling - since this
would involve draining the tank - and I might even damage the coil in the
I have tried smearing various substances round it to seal - including
plumbers mait and boss white - but these all need to be applied to a *dry*
surface and won't stick properly to a wet one.
Can anyone suggest an alternative which I can use - which will cure and
stick to the surrounding metal in the presence of water - maybe even
water to provoke a reaction of some kind?