Instead of taking it through the roof they used what is sometimes called a quick vent. It has a diaphragm in it so when the sink drains it allows air in the vent to aid in draining the sink. When the sink empties the diaphragm is suppose to close to prevent gas from the holding tank into the living area. It should just screw off the pipe. Go to Lowe's or Home Depot or any plumbing supply shop and get a replacement. Take the old one with you to insure the replacement will fit. Jim
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2006 3000RK
2009 Ram 2500
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