Compression Wallplate Elbow 15mm x 1/2" <https://www.toolstation.com/compression-wallplate-elbow/p74070>
Hose Union Bib Tap with Double Check Valve 1/2" DZR <https://www.toolstation.com/hose-union-bib-tap-with-double-check-valve/p54792>
I was under the impression that if you install the elbow so that supply pipe is coming straight down to it, the tap should screw all the way into it & end up pointing down. (I'm pretty sure that's what I did with the old ones, which were removed as part of a kitchen renovation, so I've installed new ones in a different place outside.)
In practice, however, I installed two of these the same way but they ended up pointing in slightly different directions, neither straight down. I ended up packing a couple of fibre washers in each elbow until I got the right direction. What am I missing?