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I just use the ball valve type. JG on one side NPT on the other. I have a tap, but you could use a steel or brass fitting to cut the threads.
I add a hose to the other end and curl it back over and clamp it at a level just below the overflow or max water height I ever want in the tank. If the water rise up to the hose, it will get sucked in and block the air. This will cause a full siphon to start and drain the water down to the inlet of the standpipe, preventing a flood.
Bean
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