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Radiator tail leaking

Discussion in 'Plumbing and Central Heating' started by Mat-Moo, 20 Oct 2019.

  1. Mat-Moo

    Mat-Moo

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    Just installed a new radiator and valves for mother-in-law, had to cut and shut some pipe but all good... except the damn tails on the radiator (where they connection into the actual radiator) are leaking. I've taken them apart again, cleaned up, plenty of ptfe and screwed back in, and still dripping. I cant physically do them any tighter into the radiator, so at a loss as to what to do now? Thinking of trying boss white or something? Words of wisdom welcome, as never had anything like this happen before.
     
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  3. lightning

    lightning

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    20 wraps of ptfe tape
     
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  4. johnny2007

    johnny2007

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    Tails do not have an end, so you can screw them as much as you want, if the thread is not sealed, they will leak.
    I've never been in your situation, but I have seen a plumber using ls-x on both threads (radiator and tail) as well as the ptfe tape.
    Another thing a plumber told me is to always screw the tails in without any ptfe first, unscrew and hoover any metal shavings.
    Got to say, new radiators have plenty.
     
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  5. ianmcd

    ianmcd

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    some modern rads need an awful lot of ptfe
     
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  6. CBW

    CBW

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    Are you applying the ptfe in the correct way?
     
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  7. Madrab

    Madrab

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    Use gas PTFE tape, 7 wraps, turn onto the thread anticlockwise when tail held in left hand thread on the right, so when screwed in, the tape doesn't loosen. Tighten into the rad tapping 3/4 of the way in at least.
     
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  8. gasbusters

    gasbusters

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    If you mean the join goung into the rad, wrap ptfe 16 -20 times.

    If its the bolt onto the valve, wrap ptfe around the olive 3 times.

    Post up a pic
     
  9. winston1

    winston1

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    Olives don’t need PTFE tape.
     
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  11. Jackrae

    Jackrae

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  12. Nige F

    Nige F

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    Boss white and hemp (y) you should be able to get a small packet of hemp from a plumbers merchant.
     
  13. oldbuffer

    oldbuffer

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    That paste (post 9) sounds like an epoxy glue. Good luck taking the tail out again if you use it!

    As said above, enough wraps of PTFE wound in the right direction (see Madrab above) will seal yet enable the joint to be dismantled in the future.

    I'd start with 15 to 20 wraps of ordinary (thin) PTFE. Screw the tail in. If it doesn't start to get a bit tight after 4 or 5 turns (threads), unscrew, remove tape, and replace with + 5 wraps (so 20 to 25) and try again.

    If you screw it all the way in so that the tail hits the open end of the radiator's female thread, it will never seal.

    If the above doesn't work, try Loctite 55, but remember to "rough up" the male threads on the tail.

    Others suggest Loctite 577, but I've never used it so can't comment.
     
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  14. gasbusters

    gasbusters

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    They do if they (compression joints) are leaking. People wrongly assume you put the ptfe on the thread of a compression fitting. If you need ptfe, it goes on the olive as thats were the leak will be from.

    But on rad tails going into rad, its16-20turns of ptfe tape on the thread.
     
  15. CBW

    CBW

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    Not necessarily the olives, but applied to the olive where an olive has been overtightend, distorting the pipe, and customer or landlord won’t pay for a re-pipe :rolleyes:
     
  16. Mat-Moo

    Mat-Moo

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    Lashings of PTFE tape seems to of done the job! Thanks all
     
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