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If the vent was blocked it wouldn't drain properly. It would "chug-a-lug" as air would have to enter thru the drain hose. Think of taking a gallon jug and turning it upside down to pour out the contents.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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