Cut out old 3/4†union, rotted out 1/2†90 , 1/2†tee (all copper). Replaced with new 3/4†x1/2†reducer, new piping, and fittings in place of old rotted out fittings. Tying into the old line a shark bite coupling needed to be used, the old piping was collapsing under the pressure of the press tool. Customer had been made aware and tech offered to give an estimate for replacing the old pipe, customer declined at this time.