Hope you get this reply Bubblehead,
I am ok doing most things so aware of the draining and care disconnecting pipes etc, but just need to get a diagram of the job in hand really, The main thing is not knowing if the said 'O' rings are actually in the line, coz if not there is obviously something more technical to correct and if thats the case 'I won't touch it'
Thanks v much for your reply.
Dave e, January 2010