Happy Friday peeps, just after a sanity "check" here.
Just mocking up the bathroom plumbing, do I need single check valves on the cistern and the hot and cold to the in-wall sink mixer? I have confined with the company that the mixer doesn't have them built in.
The shower is a DuoTurn iBox2 which I believe has checks built in already.
Image attached, hot and cold supplies coming in from the left, I'll have to jump over the hot, just mocked up for now.