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Old 05-29-2021, 06:09 AM   #15
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We had that problem on a previous trailer where the valve was by the tank and had a remote pull some 5-6 feet away near the outlet. If the trailer tipped at the dump station, water would hang in the pipe.
There are sewer caps that have small caps (sized to connect a garden hose) on them. Get a small container and open the small cap to let any water drain out and then open the big one. A second twist off valve was not really an option for us because of the outlet location.
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Old 05-29-2021, 08:49 AM   #16
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Originally Posted by TXiceman View Post
Easy solution is to add a third valve at the out let.

I added 3rd valve to mine for same reason.
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Old 05-29-2021, 12:24 PM   #17
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Originally Posted by Nwcid View Post
As I said in my post, I had the same problem where are twist on is not practical. It was a 5 min project to cut the current bayonet fitting off and install a glue on one in its place. I cut the pipe back enough so that I would have room to cut it again if needed, but is actually shorter than "OEM". Works great.

Thanks All, I will try that.
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Old 05-29-2021, 01:01 PM   #18
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I was greeted once years ago. Ever since I replace the 3" cap with one that has the small hose cap on it. I first remove my hose cap. I have the slinky hose right there to catch any leak or drips. After removing the hose cap I take off the 3" cap and dump the tanks.
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Old 05-30-2021, 05:15 AM   #19
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That hose cap is a good idea but if you can put a small clear section between the gate valve/s outlet and the end cap your can see what kind of surprise awaits you. Not every RV has the space to be able to do that, but if possible it at least avoid surprises. My Raptor had enough room to install the "third final" gate valves referenced by many above and also enough clearance to put a clear after that gate valve. If I had want to be really anal, pun intended, there was room to put a short straight clear between the original outlet and final gate valve to see what was collected behind that valve.

Bob I'll take what is behind door number 3.
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Old 05-30-2021, 05:48 AM   #20
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IMHO, those Twist On Waste Valves should be on the must have list. For some reason every Truck Slide In,TT or Fiver I’ve owned has a surprise for you behind that waste cap, never did happen on our MH’s ��.

I have the the Twist On Valve works great with one minor modification, in the locking ears on the bayonet fitting drill a small whole and thread a set screw in, to keep the valve from twisting off while removing the waste hose.
If I hade a do over probably would go with the glue on style.

This should solve your vacuum issue as well
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Old 05-30-2021, 12:26 PM   #21
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I use the Twist On Waste valve every time I dump. I put it on with the slinky hose. After black water is dumped, I close the Twist On Waste valve, open the gray water and flood the black tank. Let it sit a minute and open the Twist On Waste valve. If there is no one at the dump run the rinse thingy for a few minutes.
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