I think the screwed on fitting is a vent; common in mobile homes and apparently some campers. I believe these can be found at any home repair box store. There are some that are much higher quality than others; cheapo (like used in a camper) would be about $5-10 and the higher quality about $20 more. The better quality are worth the money imho as you don't get stink out of them. Make sure you have the correct PVC adapter, if needed, to use a different one. Take yours off before buying a new vent and if the sink drains, the vent was the issue. If not, time to start some plumbing adventures!
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wiredgeorge Mico TX
2006 F350 CC 4WD 6.0L
2002 Keystone Cougar 278
2006 GL1800 Roadsmith Trike
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