I'm looking to replumb the return lines in the photo for a slide. I'm thinking that my best bet would be to attach a three way valve to the closest return in the photo. That way I could shut off that return line when using the slide. Would that be best accomplished by inserting a three way valve on that return alone or is there a better method? I'm guessing that I would need to adjust the valve so it doesn't run in the typical inlet T configuration to make this happen. That seems like the easiest solution but I don't want to cause other problems. Thanks.