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  • How too short? Are you putting a 1/2" to 15mm compression fitting inside? As long as the 3/4" threads bottom out (into port on iBox) with a nice tight fit (plenty PTFE) then anything else will just tighten into the 1/2" threads. However I would probably just use one of these;
    http://www.6thplanet.com/store/product/plubr1bspmto22mm_l.jpg

    (3/4" BSP to 15mm compression) Ditch the bushings/reducers and use this straight into the iBox then pipe off that...

    Where abouts are you? I might know a good local plumbers' merchants.

    (trust me I'm a builder.....)

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