I'm a complete noobie here and will have a ton of questions in the future for all the pros out here, but right now for my first question, I can't figure out how to adjust the auto fill valve to my pool. It's made by Korky's. My problem is I have an attached spa and the water level in the pool is the same level as the spa which, to me means if I heat the spa that hot water will flow into the pool. The valve itself is plastic and doesn't look too sturdy so I don't want to force anything. Any help will be greatly appreciated.