Hi Steve.
First, try the "Winter" position. That should be the same as "Close".
Second, since your pool is above ground and the plumbing is exposed, consider installing PVC ball valves near each drain (Skimmer included) and return. I prefer the kind of ball valve that's also a quick-connect, so when it's time to shut the pool down for the winter, it's easy to disconnect and drain the plumbing and merely plug the returns and drains.
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