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Old 10-16-2016, 02:10 PM   #1
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Sewer line/ holding tanks questions

Hello all. We just got our 2nd travel trailer, but this is our first with holding tanks. I've read several threads about emptying and cleaning the black and gray tanks and I understand all that. But I need advice from others who know more about this than me. We are weekenders with the occasional weeklong trip. We have a 2016 Palomino 318tshbk and the gray tank valve is near the front of the trailer while the black tank valve is near the rear. When at the campground, do I hook up the sewer hose to the gray tank and then hook it up to the black tank when I'm ready to empty it? Or do I get two hoses with a Y connector. I've seen both, but not sure which to do. Any advice is greatly appreciated.
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Old 10-16-2016, 02:31 PM   #2
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Hello all. We just got our 2nd travel trailer, but this is our first with holding tanks. I've read several threads about emptying and cleaning the black and gray tanks and I understand all that. But I need advice from others who know more about this than me. We are weekenders with the occasional weeklong trip. We have a 2016 Palomino 318tshbk and the gray tank valve is near the front of the trailer while the black tank valve is near the rear. When at the campground, do I hook up the sewer hose to the gray tank and then hook it up to the black tank when I'm ready to empty it? Or do I get two hoses with a Y connector. I've seen both, but not sure which to do. Any advice is greatly appreciated.
My rig has only one outlet. I would guess that yours has tanks widely separated.
Leaving the grey hooked up allows you to simply leave the gate valve open and drain as you go. Not many issues with that, although I like to have the flushing action of several gallons to carry any food particles out. Not too big a deal.
On the other hand (and drain) the black should remain closed until it needs emptying. Look up the subject regarding the brown pyramid, etc. I don't like the idea of hooking them together, since the black will back-flush up the grey hose when you drain it. Whether that presents a problem to you will be a function of how much slant you have in your drain lines.
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Old 10-16-2016, 02:58 PM   #3
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You could always plumb the front to the rear and only hook up hose once, as I've done
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Old 10-16-2016, 03:24 PM   #4
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I think I would just buy a Y fitting and the extra hose needed to make it work.

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I'm kind of lazy that way..
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Old 10-16-2016, 03:57 PM   #5
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Plumbing the front to the rear, ala Bob Caldwell, would be best, but it isn't always possible.

If you're somewhere for a week, I'm guessing you'll drain your grey tank two or 3 times in that week. You'll probably just drain the black before you leave. So I'd hook the hose to the grey and use as necessary. When you're ready to leave, let the grey tank fill. Then put the hose on the black tank and drain and flush it. Then move the hose back to the grey and drain it. This way the grey will flush out the "crap" in the hose from the black tank.

If you use a wye fitting, then
1) you'll need THREE hoses rather than 1 (and somewhere to store them), and
2) the one from the wye to the black tank won't get flushed.

Just my thoughts.
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Old 10-16-2016, 04:25 PM   #6
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Thanks a lot! This gives me some guidance on what I can do. I like the idea of using one hose, I just didn't know if it was feasible. I just wanted some feed back from more experienced rvers .
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Old 10-16-2016, 04:47 PM   #7
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Thanks a lot! This gives me some guidance on what I can do. I like the idea of using one hose, I just didn't know if it was feasible. I just wanted some feed back from more experienced rvers .
Be aware that you may need a LONGER hose, though!
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Old 10-16-2016, 05:32 PM   #8
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Our 5er has the black and grey tank in front and a galley tank in the rear I use a y fitting . You will need one long hose and one short one . That's what works for us . Both hoses fit in the rear bumper .
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Old 10-16-2016, 05:40 PM   #9
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Our 5er has the black and grey tank in front and a galley tank in the rear I use a y fitting . You will need one long hose and one short one . That's what works for us . Both hoses fit in the rear bumper .
If you're using a wye, that implies THREE hoses. Or are you putting the wye right at the sewer?? I guess that would get you down to 2 hoses.
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Old 10-16-2016, 05:42 PM   #10
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The wye goes into the sewer pipe
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