I didn't do any of this (bought the house this way), just started learning and now its all starting to make sense, I've seen pictures on here of people having separate lines with 2 way valves all joining into a quad PVC, looks much easier and cleaner.I went with 3 way valves on everything the first time... This time I am going with 2 way Jandy valves for everything.. It is more expensive but it gives great control over every single suction and return side pipe... it can be used to troubleshoot each pipe for leaks, it is just a better way to do it..
Is the spare drain a bottom drain or side drain? If you did all 4 in 2 way Jandy into 1 pipe for the pump it would make very easy to know if one was leaking
If you ever automate the pool and spa valves it would take 2, 24v systems to make it work instead of 1 for the 3 way valve..
bottom drains are connected at skimmer with diverter UFO, side drains are the spares that were capped off.
"If you did all 4 in 2 way Jandy into 1 pipe for the pump it would make very easy to know if one was leaking " that's why I'm thinking if I'm going to make this project happen I mine as well plumb the spare drains in with a 2 way valve with everything else, couldn't hurt......
I have iAqualink, the suction side and return side have never lube electronic actuators and I have "pool mode, spa mode, spa drain and spa fill" that makes the actuators automatically orientate correctly