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Can a Fluidmaster 400uk bottom valve fit into a old style ball cock valve handle operated cistern

Discussion in 'Plumbing and Central Heating' started by PHIL269, 3 Mar 2017.

  1. PHIL269

    PHIL269

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    Hi
    Will a Fluidmaster 400uk bottom fill valve fit into a old style handle cistern to replace the ball cock valve which keeps leaking.
    What are the steps to do this please?
    Thanks.
     
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  3. oldbuffer

    oldbuffer

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    Probably. You need to look up the measurements of the Fluidmaster on their website, and work out whether it can be physically fitted without interfering with the syphon in the centre of the cistern.

    If it will fit, then:

    1. Turn off cold water feed to cistern, flush cistern, remove remaining water in cistern (wet vacuum cleaner or a sponge).
    2. Disconnect cold inlet to cistern at base of shank of old valve.
    3. Remove nut (usually plastic) holding old fill valve in place.
    4. Remove old fill valve and float. Clean inside and outside of cistern where Fluidmaster will sit.
    5. Adjust Fluidmaster height to height of old valve.
    6. Install Fluidmaster. Black cone shaped washer inside cistern, cone down.
    7. Fit nut to shank under cistern and tighten, making sure float valve is free to rise and fall.
    8. New fibre washer in tap connector on inlet pipe (1/2"). Reconnect and tighten inlet connection. Tight but not over-tight.
    9. If 8 and 9 difficult because little play, slacken nut on shank until enough play to get connector on, then hand tighten each bit by bit, final tighten back nut, final tighten connector.
    10. Restore water connection. Go slowly checking for leaks.
    11. When no leaks, adjust fill height to line on inside of cistern
     
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  4. omega015

    omega015

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    Assuming your cistern is a bottom fill inlet (the water pipe enters at the bottom and not side) then it should fit (measure what height the cistern has). But it all depends how much room you have inside the cistern and if the siphon might get in the way.

    Well oldbuffer beat me to it and provided a more in-depth answer :D
     
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  5. PHIL269

    PHIL269

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    Thankyou for your help and advice.This gives me the confidence to do this as not had any plumbing experience.
    cheers
     
  6. Bosswhite

    Bosswhite

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    Hook out the old siphon and install a flapper valve should give you more room, and no worries about the diaphragm disintegrating in a few weeks time.
     
  7. PHIL269

    PHIL269

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    Have replaced the valve ok but it is leaking from flexihose nut where it screws onto valve brass shank. tried tightening
    Should i use a sealant on shank thread?
    thanks
     
  8. oldbuffer

    oldbuffer

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    Try one of these http://www.screwfix.com/p/arctic-products-flexible-tap-connector-washers-10-pack/2035j
    May be the internal seal washer has been damaged while installed on the old inlet valve. Some valves have a rather sharp edge, which may seal but will damage the rubber washer in the flexi.

    If that doesn't work, replace flexi.

    Don't use sealant on the thread. Sealant is only used on threads where they are taper threads, which these aren't.
     
  9. DIYnot Local

    DIYnot Local

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