I recently bought a wall-mounted bath mixer. At the rear there's a
3/4" female thread into which fits a male-threaded tube which, after a
dog-leg, reduces to 1/2" to take a tap-connector. On the wall side is
a conical chromed escutcheon to neaten the tap-wall interface.

The problem is that with the escutcheons fitted, the end of the
feed-nipples only just poke through the back of the wall (plasterboard
+ tiles), leaving no room for the tap-connector.

The interim solution was to make some longer 3/4" nipples by sawing
off the tails of an old tap. But while protruding enough to allow the
tap-connectors to be fitted, there's still not enough depth to fit the
escutcheons.

The solution would be to get some nipples about 3" long but I can't
find any. Does anyone know if they exist, and if so who does them?

I wish my walls were 3mm thick. Then there'd be no problem. I have
thought of cutting away some plasterboard so as to efectively hang the
tap only on the tile but that doesn't sound too good for the tile.

TIA,

TC.