The joint pictured is leaking. It’s in my loft just above the bathroom. I’m told it’s a 15mm push fit elbow joint. Can I isolate the water just to the power shower or do I need to turn off the water at the mains? Also, is the elbow joint broken or can I give it a push and/or a twist to reestablish the joint? They’re only a couple of quid so just need to know the optimal solution. Shower is no more than 5 years old.