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Weird 22mm compression fitting

Discussion in 'Plumbing and Central Heating' started by koomber, 30 Jul 2018.

  1. koomber

    koomber

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    Was ripping out the bathroom and wanted to put a new bit of 22mm copper pipe onto an old compression fitting. I picked up the wrong compression nut of fitting I'd bought and it would go on. After having a look I found the one that came off the fitting and it had a different number of threads... they were far tighter.

    The nut was stamped with 22mm but it wasn't compatible with a standard equivalent. Anyone come across anything similar? In the end the fitting leaked like a bar stud so I cut it out and soldered it back up. But I'm just wondering what I'm missing.
     
  2. muggles

    muggles

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    Yes, there are two different threads for compression fittings. You normally find the finer thread on zone valves and some hot water cylinders
     
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  4. dilalio

    dilalio

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    Honeywell MZVs in particular, use a different thread which makes replacing other valves for a Honeywell that much harder, when you can't get to the olives :cautious:
     
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  5. koomber

    koomber

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    Cheers lads.
     
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