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Old 08-03-2013, 08:08 AM   #11
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I hard plumbed the rear galley tank and the front grey tank together and leave the valve open between the two and they both fill equally by adding a slide valve at the outlet. One dump valve to connect rather than having to have 2 slinky hoses or a Y. When I dump, I close the slide valves on the grey tanks, open the black tank and then the grey tank valves.

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Old 08-03-2013, 04:55 PM   #12
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Originally Posted by Voortrekker View Post
I like the idea of a bayonet valve to equalize the amount. I recently replaced the clear extension tube used for dumping the tanks with one that had a wash-out. I noticed that the dealer also had a wash-out extension with a valve...should have bought that one. Oh well, next time....
You could add a blade valve before the black dump to accomplish the cross connection but is there room under there and it would be a crawl under unless you go cable or electric?

As for the flush valve. I know of two on the market. The Camco and FlushKing. The FlushKing is much faster. The Camco is a little cheaper.
Both work well and you can flush your gray as well.

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Old 08-04-2013, 11:43 AM   #13
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Thanks, Ducky....

I went to the Flush King Web page ( and read about the device. I think I'll try to find one, as it will accomplish a lot more than the item I originally described.

That is: The flush device that I described above had a knife valve that attached directly to the RV's flush-out port. That valve was connected to a clear tube with a flush-out hose fitting.

On the other hand, the Flush King has a clear tube (with attached flush-out hose port) that attaches to the RV's dump port...and the knife valve is at the end where the sewer hose connects. That way I could close the knife valve and then leave both of the RV's Gray valves open, which would allow the two tanks to equalize and provide the full 80 gals available. When dumping, I could then momentarily close the two Gray valves, then dump the Black tank, followed by a flush with water from the combined Gray tanks. By closing the Flush King valve, one could then flush out the individual RV tanks by proper manipulation of the respective valves.

I have a factory-installed Black tank flush-out system. But I DO like the idea of being able to also use the Flush King to do a clean out of the Gray tanks.

Thanks for the tip, Ducky....this forum is GREAT!

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