Thought I would get some of your thoughts on this plumbing layout------it's pretty basic, but any thoughts are welcome, I could be missing something. The room dimensions are 10 x 10---the adjacent room opposite the long sink is a bathroom where I can tie into the drainage and hot and cold lines. I'm thinking of adding an additional smaller stand-alone sink as seen.
Also, if you move and want to take your water panel with you, it will be a lot easier to do if you have the valves there.
Also, I don't think a B&W darkroom needs a tempered water supply. The only reason I installed one is that a few years ago a guy on ebay was selling a bunch these Powers Photopanels un-used for $60 a piece.
10-4 on the ball valves to isolate the darkroom plumbing----thank you. My plan is to use flexible washing machine hose from the hot and cold supply with shut-off valves as shown. I'll probably go ahead with the regulated mix, I certainly like the idea. I hope to get going on building the sink on my 4 day holiday weekend. My only concern about these plumbing plans is that I will have the drainage properly vented, I'm going to rely on the plumber for that.
I'll have to say now that I have the thermostat, I'd miss it in a new darkroom. It makes filling the Jobo very easy and its already tempered when full. I didn't use PEX but in your case the PEX may be the way to go.
I have a master shutoff (ball valves) for the entire system and it certainly is useful. I also have temperature regulated output as well as a "standard" faucet. The temp regulated water goes though a filter, then there are 2 outlets, each with it's own shutoff.
I would suggest the stainless steel braid hoses (they should be on your washing machine too).
There are drain fitting that eliminate the need for a separate vent pipe. Not sure how well they work but they would greatly simplify your plumbing.
I have filters and mixing valve mounted on a panel. Two taps are regulated and one is for cold water. All the taps are filtered.
It would have been nice to spread out more taps along the entire length of sink, but using garden hoses I can reach all parts of the sink.