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Old 08-17-2012, 05:56 AM
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I would use the still use the larger hole for the main overflow and the smaller return hole for emergency. Depending on what you want keep, you can always dial it back if it's too much. This way you can fine tune it once it's all set.

As for the 2 in 1, I think you are better off doing a dual using a gate valve for better control.
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