More wierdness

[FloridaPhil]

New to my 2017 Four Winds 26B and came across a real stumper. Trying to drain the black water tank and nothing came out! Figured it was plugged with something but not a clue what since we only use the toilet for peeing. I bought a flushing valve and it would build up so much pressure that it would blow it off the connection. I finally looked under the off side of the RV and lo and behold, another gate valve for the black water tank. I have always pulled tow behinds before this class C and have never seen such a configuration before. Live and learn and we are learning quite a bit with this RV. The walk through never covered this valve.

Phil

[Popfla]

I had a 2016 Coachmen class C that was the same way - - a second valve on the opposite side from the drains. I still don't understand why it was there; it didn't seem to serve any real purpose.

[Bob Denman]

It seems that when they have to run a "sewage pipe" across the belly of the rig: they add a second shutoff valve closer to the source.
Glad that you found it!

[FloridaPhil]

Glad I found it too, I was going crazy trying to figure out what was wrong.

[Mustang46555]

Got the same set up on our RS26. Confusing at first but needed due to the plumbing layout.

[DbleDutch]

Our 24F has the same layout for Black tank drain valves. The valve closest to the tank keeps solids from dropping into the drain line and blocking it. Think of 6-8' of solids in a 3" pipe; can you say "blockage". This is how it was explained to us.

[PAtrailtrimmer]

My Axis has the same “extra” valve. My first emptying of the black tank was interesting.

Stay at a park that brought a portable dump station to the site. The operator and I were both puzzled why the tank would not drain. Then we found the second valve on the opposite side of the rig. Problem solved.