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Loft water tank pipe fitting size

Discussion in 'Plumbing and Central Heating' started by scottpetrie, 17 Apr 2021.

  1. scottpetrie

    scottpetrie

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    I have just purchased a replacement float valve for my loft water tank. Its 1/2”. The fitting on the pipework going into the tank is bigger than that. Does anyone know what size it could be? Im think maybe 3/4” or 22mm?
     
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  3. dilalio

    dilalio

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    If this is for your CWSC you'll need a part II ball/float valve. Either get a 3/4" one or change the fitting on the tank supply to suit a 1/2".
     
  4. scottpetrie

    scottpetrie

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    Yeh thats what I have, a part 2 but its 1/2”. Will it be 3/4” fitting I need for the supply end?
     
  5. JohnD

    JohnD

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    the 3/4" one is likely to be less noisy, and to fill the tank faster. Better all round

    however it will be more expensive.

    you can buy a new cone and washer to renovate your old one, and hang it in a plastic bag next to the tank ready to swap next time it needs it.
     
  6. scottpetrie

    scottpetrie

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    I already have the new one, ready to fit, just need to know what fitting I need to get from 1/2” male on the valve, to 3/4” (I think) female from the mains
     
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  8. Nige F

    Nige F

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    3/4 x 1/2 inch brass bush + ptfe tape.
     
  9. HERTS P&D

    HERTS P&D

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    Plus new fibre washer! ;)

    Come on Nige not like you to forget anything.

    Andyb
     
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  10. scottpetrie

    scottpetrie

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    Okay so 1/2” female x 3/4” male compression or BSP
     
  11. dilalio

    dilalio

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