Need help identifying this pipe / hose in bathroom

[pbsled]

Does anyone know where this drain (assuming that is what it is) comes from? Its just forward of the hot water heater on a 30P and goes through the floor and empties aft of the sewer dump. In this pic I have yet to drill the hole to route it back through the floor. Thanks in advance!

[RISK]

Drain tube for you AC condensation?

Airstream has had those for a long time.

[pbsled]

I wondered if that was it. I may run the A/C on a humid day and see if it works, but I think my A/C is just draining down the back of the shell. I don't think the roof unit is original and I have remounted and sealed it around the flange but didn't remember any hoses. Thanks for the hint and I will pull the A/C cover some time and see if I can find the other end. It would be great to have this functional and keep water off the sides of the camper.

[RISK]

If there is a double layer of gasket under the AC that would be a good indication. It would certainly be fairly depressed but may be evident via a casual inspection via ladder.

Perhaps it is the drain and it is either:
A) clogged
or
B) not used in the last install

I wish mine had one, I made a rig that simulates the drain system Airstream uses as I live in Texas and the amount of water the AC puts out is astounding...

Ian

[pbsled]

Same view as OP, but after subfloor and shell attachment complete. Drain tube is routed through outer band, and grounding wires routed inboard of shell. I am using commercial self-stick tiles stuck to each other as the shim to elevate and isolate the aluminum from the treated subfloor.