OD of 10 mm female end feed

Discussion in 'Plumbing and Central Heating' started by markocosic, 20 Nov 2017.

  1. markocosic


    10 Nov 2007
    Thanks Received:
    United Kingdom
    I'd like to elbow from 10 mm copper running down a wall (that's to be plasterboarded) to 15 mm copper sticking out of it ready to pick up a TRV (mounted horizontally; rad to be piped TBSE).

    This orientation:


    Why - TRV in the correct (horizontal) orientation; clutter free floor; looks less gash than an elbow into the TRV.

    What's the best option?

    Ideally I'd like an 10-15mm F-F elbow. Can't seem to find such a thing. Do they exist?

    Else: is a 10 mm F to 15 mm M fitting reducer into a 15 mm F-F elbow the right way to do this? I can run the 10 mm down a mortar line and take just the fat chunk out of one brick with this option.

    Or: Does a 10-10 mm F-F elbow fit inside a 12-15 mm F-F reducer? (is the outside of a 10 female mm elbow close enough to 12 mm so solder it into a 12-15mm reducer)

    and this:
    (not got any to hand to measure)

    Or: are fitting reducers available the "wrong way" - 10 mm M with 15 mm F, rather than 10 mm F and 15 mm M like this:


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  3. Last edited by a moderator: 20 Nov 2017
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