Need a diagram for installation of the moentrol 3 functions built in transfer valve
Model 3320

Call Moen. They are very helpful. I am sure they will send you one w/o problem.

Here you go! Click on: installation diagram for Moentrol 3 function transfer valve - Google Search And scroll down 6 entries and click on "INSTALLATIONS"
Increase the size to 75% and you're in business. Good luck, Tom