Testing of new water feed lines:
Place a 3-inch (75 mm) long brass barrel nipple and a blind brass cap into each female wingback and blind caps on every male wingback. And turn on the water. Were at all possible have someone stand inside the bathroom or near the new pipe work to yell out if there is a crimp ring not sealed leaking out water. Turn the main street pressure on slowly. After you have tested the cold lines open up the hot valve and test the hot pipe work. Turn on the shower and charge the line feeding the shower rail or shower spray rose head.