Where does this intake go?

[fullabeatz]

I have a (new to me) 2012 Avalanche 341TG. I'm not sure what the intake circled in red is for. A little help?

Does the black tank flush in the blue circle flush both tanks or just the front one?

Thanks!

[JRTJH]

It's probably the port to ingest antifreeze into the trailer plumbing during winterization. Attach a short piece of hose, turn the valve below it to winterize, put the hose into a gallon of antifreeze, turn on the pump and it'll draw the antifreeze into the system.

[notanlines]

It will probably just flush the front tank. A single garden hose would hardly carry the volume/pressure to properly operate two tank flushers.

[Jmayse]

Did you confirm that the BLUE circle is the flush for the black tank? That's what I am trying to figure out?

[sourdough]

Originally Posted by Jmayse

Did you confirm that the BLUE circle is the flush for the black tank? That's what I am trying to figure out?

The OP made one post on 6/14/2018 and has not posted again so doubt you will get a response. I am sure the inlet circled in red is the winterization port as you can see the winterization switch below it.

[JRTJH]

Originally Posted by Jmayse

Did you confirm that the BLUE circle is the flush for the black tank? That's what I am trying to figure out?

The decal located directly above the blue circled connection pretty much defines its function.

[Jmayse]

You would think it was more clear but this is what I see:




I attached a pic. Hope it comes through.

I don't know if its for black tank only? or the three tanks I have?

[fullabeatz]

Yes, on my rig the blue circle is a black tank flush. It is only connected to the front black tank.