Durso Standpipe? Is that what you're referring to with the upside down u?? That works, for the most part, but the Herbie style is the best.
Google both for an answer.
You're going to get a gurgling noise if air is being sucked into the drain, thats what you want to stop from happening. A herbie does this by restricting the flow with a gate valve below the drain point on the intake line so that it is restricted to the point where only water goes into the pipe and no air. You can fine tune it to that point.
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