Shower arm extension

[mickyyoungplumb]

Hi, I am fitting an ensuite with a recessed shower valve and two shower outlets. One a rain head up high and a secondary shower outlet near the valve. Anyway I set my backplate elbows correctly in the wall. Now the tiler has tiled, he has built the tiles out further than anticipated and now I am 15mm - 20mm short of screwing the shower arms into my backplates. ny solutions or fittings anyone knows of? Can I buy 1/2 male - 1/2 female couplings.?

 

[denso13]

http://www.directheatingsupplies.co.uk/pid_28418/C54105/1/2-Inch-Tap-Extension.aspx

Widely available

 

[Charnwood]

15 to 20mm, that's a lot of tile adhesive.