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Old 02-24-2016, 01:31 PM   #1
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Holding tanks

Hi just spent 2 weeks at the 500 in daytona. Our 14 lincoln rushmore has a galley and grey levers . I can only get 4 quick showers out of it before it says full. When i pull the grey i get nothing its all going into galley. Iam i not doing something to equilize something. I thought this trailer would have a big tank
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Old 02-24-2016, 01:42 PM   #2
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Some of the Redwoods were plumbed that way also, the galley, shower, & lavatory went into one tank & only the washing machine went into the other. Most folks used an add on valve onto the dump line & opened both grey valves to equalize both greys. Just be sure to close both grey valves before dumping black tank.
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Old 02-24-2016, 04:54 PM   #3
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That's what I did...added a third dump valve at my main drain. Fairly easy to do. Now while on extended stays, I basically have the ability to store up to 80 gallons of grey water. As mentioned, you need to close the grey tanks before dumping the black. Not all RV's are plumbed so you can do this...some have a separate grey dump valve location for each of the grey tanks i.e. one towards the front and one towards the back of the rig.
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Old 02-25-2016, 08:42 AM   #4
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So where do you tie in this other valve at main. Should I not take down the bottom to get at plumbing and join both grey tanks so the both fill at same time. Never really seen the tanks before so I don't no what to look for
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Old 02-25-2016, 08:46 AM   #5
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So where do you tie in this other valve at main. Should I not take down the bottom to get at plumbing and join both grey tanks so the both fill at same time. Never really seen the tanks before so I don't no what to look for

On mine, there is separate cables for each grey tank. I placed one of these Valterra valves on the end of the sewer hook up, closed it and then opened both grey tanks. This will allow the two tanks to equalize.
You can get them that hook up the same way the sewer hose does.
http://www.amazon.com/Valterra-7201-...velttera+valve
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Old 02-25-2016, 04:00 PM   #6
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What I did was to cut off the ABS fitting where you connect the sewer hose. I then glued on a 3" ABS Male threaded adapter and bought a female threaded valve. Screwed it on the male adapter and done!. If the blade valve ever fails, I can easily un-screw it and install a new one. Again, this mod only works if both your grey tanks are connected to your one main drain. You can Email me (address in my profile) and I can email you a couple of pictures of what mine looks like.
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Old 02-25-2016, 04:19 PM   #7
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Stan, I'm not sure why you would cut and glue on an adapter thread, when you could just by the Valtera valve like Lloyd posted. But if it works for you, the fine.
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Old 02-25-2016, 06:16 PM   #8
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Mark, I wanted a stronger connection. When I did mine I could have bought a valve that could be attached with the "pins" on the existing drain fitting. I felt that these pins might break at the most inopportune time. I Decided to go with the stronger mount - and it can be removed/replaced easily..
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Old 02-25-2016, 06:35 PM   #9
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and I guess the twist on with pins could be stolen also. Just curious.
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Old 02-26-2016, 08:43 AM   #10
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Not sure what's got you so concerned. Your right though...if someone wanted my sewer dump valve they could take it. Is that a common occurrence in your neck of the woods?
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