You need a vent close to the sink or what ever is on the end of the drain line for it to drain properly. That is the reason for the studor vent in RVs. Otherwise you would need to run a vent line to the tank vent.
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For now 1996 Dodge Ram 5.9 Cummins 365HP 830TQ pulling a 2006 28' Dutchmen Fifthwheel and at times a 16' boat behind that!
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