Hello, I am new here. I wonder if I could get some help. I had a new combi boiler and central heating system installed and decided to safeguard a future loft conversion by extending the pipes into the loft. This spec unintentionally added dead legs to the system, which are currently capped off. I believe that air trapped in them is causing a slow pressure drop in the system and I also realise now that dead legs are not good practice anyway. Capping the dead legs where they tee off is not an option because is not accessible. And it wouldn’t help if I go ahead with a loft conversion at a later date. I know that linking the flow and return legs would create a path of low resistance - but would it be sensible to link them with a valve that would restrict the flow and mimic the resistance of an actual radiator? If so, what type of valve should I be looking for? This would - hopefully - eliminate the dead legs without unbalancing the system, by keeping a restricted flow across the loop. I will have a plumber doing the work but would like to hear opinions first so I can make an informed decision when they propose a solution. Thanks a lot in advance.