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Old 11-07-2020, 08:16 AM   #1
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2021 pinnacle tank flush issue

I have 2 tank flush ports on my Pinnacle , I have 2 black tanks and I made a custom Y hose so I can flush them both out at once...had both black valves open and turned on the water to let it run for a while and a little water fresh water started to come out of the bottom of the rig both Gray valves were closed

Could it be that one flush is to both black tanks and the other is to flush out the gray tanks and I had the gray dump valves closed and pressure was building ?

Don't know what to think
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Old 11-07-2020, 09:04 AM   #2
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Likely a small leak at the connection, either at the hose, or inside where the plumbing connects. Are you certain it is coming from under the camper and not simply running down the outside? Also when you flush that way you are getting half the volume in each tank to do the cleaning work. Connect the hose individually and see which one may be the culprit.
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Old 11-07-2020, 02:20 PM   #3
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I wouldn't "Y" them together. You want as much flow as you can get to flush. You'd be cutting your flow in half to each spray nozzle running them together. Most campgrounds have piss poor flow as it is.

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Old 11-07-2020, 03:29 PM   #4
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If you have 2 black tank flushes you probably have 2 of the dreaded in line vacuum breaker valves. They are notorious for leaking water. Usually they are located up under a sink or behind a panel. Differs from rig to rig but they are in line on the black flush line and you'll have to locate them. That may be your problem.
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