Hi. You can use a 15mm compression fitting, these are available in elbow or straight format - please see example http://www.screwfix.com/p/chrome-elbow-15mm/33526. Regards Justin
SO I JUST NEED TO ADJUST THE SUPPLY PIPE TO MEET THE ELBOW?
Hi, Yes the supply pipe needs to meet the elbow - then install a water 15mm compression fitting. Either elbow or straight pending which direction your supply pipe is coming from ie supply pipe coming from the bottom straight up to the shower joint - then straight compression. If water supply is coming from out of the wall - then you will need a elbow compression to meet / join the shower unit. Hope this helps regards Justin