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Discuss dripping drain off on vented central heating in the Plumbing Forum area at UKPlumbersForums.co.uk.

  1. Mgrant

    Mgrant Member

    If a drain off valve is leaking on a vented central heating system, due to not shutting off. As the washer has perished. Has anyone had success in swapping the inners over in this without draining down, if quick?
     
  2. Rob Foster

    Rob Foster Top Contributor!!

    Do mean an mt cock ? Its a drain for heating system located below the head of water for the system. .Rob Foster aka centralheatking
     
  3. heliotrope

    heliotrope Plumber GSR

    9 times out of 10 the old washer will be left behind and is tricky to get out. So not too easy to snatch.
    Better off to bung system or drain down.
     
    • Like Like x 3
    • Agree Agree x 1
  4. Mgrant

    Mgrant Member

    just a 1/2" drain off cock.
     
  5. king of pipes

    king of pipes Trusted Plumber GSR

    Got a picture of it you can swap em but need to lock the system up or it's a drain down job. Kop
     
  6. Best

    Best Trusted Plumber Top Contributor!!

    I have had to unscrew and remove the brass part and sometimes poke a small slotted screwdriver in the drain to break/remove the old washer.
    This is a good reason for not using soldered draincocks, but rather 1/2” threaded into F.I. fittings where suitable, so the entire draincock can be swapped easy
     
    • Agree Agree x 1
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