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Thanks for the responses. The shutoff valves are interconnected to preclude the "deadhead." I've never messed with Pool Plumbing, so I've really had to sit and think about how it is plumbed. It's confusing enough for me that I've decided to have a pool expert come and take a look at it with me...

Speaking of VS Pumps, the current pump has a 90 degree elbow about 3" after the return outlet. It seems to me like I should I go out 12" or so before making a turn?

That makes sense, but if there are shutoff valves on the in and out lines just before the heater, do I still need this valve? As for the pump, I currently have a single speed Hayward, but I'm replacing with a Whisperflo VST (I think that's the model..).

We recently purchased a house in S Florida with a pool that needs some serious TLC. I've already contracted for resurface, decking, lighting, etc. I'm going to move and replace most of the pool equipment, but I am confused by a valve that makes no sense to me. See the picture below: The valve...