Hello to everyone and thank you for this fantastic forum,
I am a new, first time pool owner. The pool came with the house and it's ~15 years old. After removing some badly overgrown bushes yesterday I "unearthed" what appears to be the controller valve for the, in-floor cleaning system. The cleaning heads are labeled "Caretaker 99". What I'm having difficulty with is understanding the function of the 3-way valve and check valve on one of the valve's 5 outlets. Also, the stubbed "goose neck" to the left of it (see pic attached). There is a raised, spillover spa which might explain the reason for the check valve but it's still confusing to me.
Thanks for reading,