Hi guys. A friend is renovating his kitchen and the blue pipe entering the property straight into the kitchen gets in the way. The blue pipe at the mo is right under the sink and 200mm off the floor, then a compression stop cock is connected right onto the blue pipe and then the distribution pipe branches off.The new kitchen will have a drawer with recycle baskets just under the kitchen sink and therefore the blue pipe gets in the way and will have to be cut down below 150mm off the floor, put an elbow pointing towards the external wall to allow the drawer to open and close and then branch the copper pipe off to the kitchen sink tap, w/m, d/w. My questions are:1) do they sell transition elbows so that i can connect up to the blue pipe at one end and to copper pipe at the other end? 2) At the mo, a brass compression stop cock is connected up to the blue pipe. Is therefore the blue pipe 20mm in diameter? 3) if the stop cock at the moment is connected up straight up to the blue pipe and there has never been a leak, could i connect a 22mm brass compression elbow straight to the blue pipe? Thank you very much for your time.