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    Towards the end of their life here, there were many interesting variations trying to minimize the effects of the syphoning, since the syphonage could not be eliminated. Bag traps and internal baffles were used to try to gt air through the trap and break the syphon before too much water was lost. Probably one of the last variations to try to keep them functional was the crown vent at the top of the return bend. But this location allowed debris to enter the vent and plug it.

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