OP, you need to fix your signature, so we know what kind of unit you have, and please list all the mod's too. See mine below.
If the pipe has a cap on it, it could be the sink vent. but with no picture, you know we're just guessing.
Mike in Colorado
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2004 Fleetwood Pace Arrow 37c, 8.1 gasser, (Jezebel) Ultra RV ECM / TCM, plugs wires, and rear track bar, PPE deep Tx pan w/ temp gage, Bilstein's, Sailun's & Sumo's all round, pushed by a 2002 Grand Caravan, on a Master Tow Dolly OR a WR-250 on a rail.
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