What is this drain under my 2010 T@b? Not the gray water

amelia2010tab

White tube hanging down… I thought it was the gray water from the sink, but that drain sits flush and is closer to the driver side front. When I unscrewed the cap from it some water did come out. Thanks!! 

amelia2010tab

Not sure if my pic uploaded.. 

pthomas745

What is directly above that "tube" inside the trailer?  Have you looked above that exact spot inside the trailer to trace it around?

Bayliss

@amelia2010tab, your photo posted, but can you post a photo that shows it from the other side, where it exits the trailer (and the surrounding area around the exit point)?  I am not familiar with the 2010, but can you tell us what is located directly above that (apparent) drain hose?  You should look in cabinet areas and around plumbing fixtures to see if you can find any water line(s) that are consistent with that depicted in your photo.  Follow that to where it is connected/originates and you will likely have the answer to your question.

Also, a photo of the "cap" that you unscrewed would be helpful.  The fact that it was capped suggests that it is a low-point drain for a water line to be used when you want to drain water in the plumbing lines, such as when you are winterizing the trailer.  The photos below (which I found online) are examples of low-point drain lines.  The second photo is close to the pipe fittings depicted in your photo.  Usually, the hot (red) and cold (blue) water low-point drains are close to each other, as depicted in the photos.  Yours is a single white line, which is more suggestive (to me) as being the drain for a holding tank.

amelia2010tab

amelia2010tab

Sorry for the delay! We just got back from our trip. First pic is the gray water, second is the unknown drain, third and forth are the caps, fifth is directly above it. It seems to come from the actual faucet (not the sink drain, which is the gray hose that goes off to the left and ends in the gray water drain I’m assuming). I’m thinking either vent or low point drain?

amelia2010tab

Bonus pic! We had a great time even essentially “dry camping” in the RV park thanks for your help @Bayliss and @pthomas745

Grumpy_G

I'd wager that is what nowadays is referred to as the "low point drain" for the water system. Correct me if I'm wrong, but I believe the 2010 does not have a hot water system. So there is only one drain for the cold water side. 

amelia2010tab

@Grumpy_G yep no hot water. Sounds like a “low point” drain then! Thanks!

Bayliss

@amelia2010tab, thanks for posting the photos, which provided me with a much better visual of the fresh water plumbing.  Your original photo definitely depicts the low-point drain for the fresh water line to the kitchen sink.  I had never seen the water line and gray water drain connections for an earlier model T@B, so your fifth photo was particularly helpful.  The only hose I am unclear about, as far as its purpose, is the larger diameter and curved hose that connects above the low-point drain.  All I can figure is that it it is for pulling water from the 5-gallon potable water tank (or possibly a vent tube? - - seems unlikely.)  Do you know?

Glad you had a nice trip.  Looks like you stayed at a very nice campground, which must have been relaxing.  Your trailer looks great!