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  1. #1
    Established TDF Member Finless's Avatar
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    Another plumbing question.

    I am ashamed to admit it but I don’t know how to check what size radiator fittings I have (3/4 inch or metric or ????).

    What do you measure? The diameter of the pipe supplying the water or the internal bore of the radiator fitting or the diameter of the on the thread or the size of nut that you tighten up.

    My specific requirement is to buy a few fittings to seal up some removed radiators (with sludgy water) so that they may be carried, drip free, outside for a flush through.

    Edit - I apparently phrased my question incorrectly when doing a search on the internet. I may have found some suitable info.
    Last edited by Finless; 07-03-2021 at 08:23 AM.

  2. #2
    Sorry for being a dick jb2cool's Avatar
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    scrunch up a bit of paper or a carrier bag and stuff it in the hole, no purchase necessary.

  3. #3
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    Or turn the radiators upside down so that the holes are at the top....

  4. #4
    Established TDF Member Finless's Avatar
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    Quote Originally Posted by John63 View Post
    Or turn the radiators upside down so that the holes are at the top....
    They are big and ‘kin heavy + the route out side involves a staircase and a few “up at your end” moments. It could be done without drips but I want some of these caps.

    Not to mention the quite appalling lack of knowledge on my part which needs to be ‘un-lacked’.

  5. #5
    Established TDF Member steelemonkey's Avatar
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    Have you thought of draining and then connecting the drain cock to a hosepipe to "back flush?" another drain and flush and you should be good to go.
    Paul.
    If God had meant us to breathe underwater, he would have given us larger bank balances.
    Human beings were invented by water as a means of moving itself from one place to another.

  6. #6
    Established WTF Member Spirit of Guernsey's Avatar
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    Use a wet and dry vacuum to remove all of the water and sludge before trying to move them.
    There are four varieties in society: the lovers, the ambitious, observers and fools. The fools are the happiest.
    Hippolyte Taine French critic and historian (1828-93)

  7. #7
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    Quote Originally Posted by Finless View Post
    Edit - I apparently phrased my question incorrectly when doing a search on the internet. I may have found some suitable info.
    M25 x 2

  8. #8
    Established WTF Member Spirit of Guernsey's Avatar
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    Quote Originally Posted by iain/hsm View Post
    M25 x 2
    Will be imperial, probably 1/2"BSP
    There are four varieties in society: the lovers, the ambitious, observers and fools. The fools are the happiest.
    Hippolyte Taine French critic and historian (1828-93)

  9. #9
    Established TDF Member steelemonkey's Avatar
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    Quote Originally Posted by Spirit of Guernsey View Post
    Will be imperial, probably 1/2"BSP
    Its in Finless's house so more likely 1/94 of a cubit.
    Paul.
    If God had meant us to breathe underwater, he would have given us larger bank balances.
    Human beings were invented by water as a means of moving itself from one place to another.

  10. #10
    Established TDF Member Steve Clark's Avatar
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    The nut is attached to the stem in the radiator. This is hard to remove quickly, so you need a female threaded cap to go inside the chrome nut. If the nut is ~30mm across-flats, it's 3/4 BSP. Common on older rads. If it's ~24mm across-flats it's 1/2 BSP.

    You need the inner part of these :

    https://www.screwfix.com/p/compressi...m-2-pack/65021

    https://www.screwfix.com/p/compressi...m-2-pack/38046

    To be honest, it's easier to drain the rad into a bowl with a rag. You can control the flow by opening the bleed valve. It's a lot easier to carry when empty.

    Edit : If you have TRV's, get a male cap for that valve. Otherwise it can open itself if your house gets cold. I found this out the wet way.


 
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