pressure problem

[GQuigley67]

is it illegal to do a DIY unvented install ? I'm guessing it is since you need to be qualified

 

[diamondgas]

Glad I could help to you out Andy.

 

[fagsanbooz]

lets all be honest here, it looks a bit of a mess, diy, bodge job!! the vessel is wrong! and that flexi looks a bit kinked! and judging by the way it has been described, i wouldn't want to live next door to it!!! anyway, i am wondering why you have removed a check valve that was fitted already? why? and i'm also wondering if the original description you gave was indeed 'backflow' occuring.