Bighorn 3270 waste pipes

[Gary521]

On the Bighorn 3270, there are two exposed ABS drain lines in the basement. The large one is obviously for the commode and I assume the smaller one is for the drain/vent for the washer/dryer. Is anybody sure about the smaller line as to what it is for?

 

[macjj]

I have a 2012 3070. The "exposed" 1.5 in is from the rear grey water, there is a hidden 1.5 in for the forward sink and washer (I believe). Since I don't have a washer installed (plumbed for it).


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[Gary521]

I found out that this is the black tank vent. Thanks.