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PostPosted: Tue Oct 24, 2017 1:37 pm 
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Hi All, I have refitted my bathroom but am re-using the existing ceramic cistern which was previously part of a close-coupled toilet and am connecting it to a back to the wall pan and boxing it in. I bought a new flush pipe which has a 2.25" locking nut on it but the tail of the syphon is 2" and so is the hole in the bottom of the cistern so the nut is too big. Is 2.25" the standard size and do I have to change my cistern for a new one after all? I like the big flush of the old cistern.


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PostPosted: Tue Oct 24, 2017 10:19 pm 
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The usual thread size for siphon with a flush pipe is 1.5" BSP. For close coupled toilets the flush valve usually has a 2" BSP thread around which the donut washer and close coupling bracket fit. I don't think I've ever seen 2.25" thread on a flush valve, but maybe they exist. Where did you buy the flush pipe from?

Some replacement flush valves come with outlet adaptors to allow them to be used with either 1.5" or 2" outlets.

EDIT: I'm assuming you are in the UK somewhere. All bets are off if it's a furrin toilet -- I have no experience of them.

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