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Old 02-18-2017, 01:44 PM   #1
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Sewer Question

Hello,

I just bought a Oasis 25RS. It's my first travel trailer. Huge step up from our popup! I do have a question. The camper has two sewer connections. I'm not sure I understand the difference.

One says waste water holding the other says sewer outlet connection. Pictures included.

Thanks,
Jaye
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Old 02-18-2017, 02:13 PM   #2
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sewer question

My guess would be waste water is your sink and shower drain water, and sewer is for toilet only.
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Old 02-18-2017, 02:15 PM   #3
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Agreed!
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Old 02-18-2017, 02:16 PM   #4
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That is what I would think. All TT I have seen have two valves one for waste water which is your sink and shower the other is sewer water which is you toilet. Always empty your sewer water first. That way the waste water will flush out your hose.
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Old 02-18-2017, 02:30 PM   #5
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Before you use the camper, dump a 5 gallon bucket of clean water down a drain/toilet and pull the handles to see which impact what.
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Old 02-18-2017, 02:31 PM   #6
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Thanks. So what does that mean when emptying i need to connect the hose to each?
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Old 02-18-2017, 02:35 PM   #7
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Yes, like Gonefishing1's response, connect the sewer one first and then over to the other as it will flush out the worst with it.
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Old 02-18-2017, 02:40 PM   #8
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You will need another hose for the hookup, some members here have hard plumbed the two together so only one hose is needed.
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Old 02-18-2017, 02:50 PM   #9
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Sorry to be so dense. Thanks for the replies. If I have to either get a Y connector or connect the hose separately, why does the sewer connection have a black water and gray water valve?
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Old 02-18-2017, 03:07 PM   #10
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Originally Posted by Pastorjaye View Post
Sorry to be so dense. Thanks for the replies. If I have to either get a Y connector or connect the hose separately, why does the sewer connection have a black water and gray water valve?
Three holding tanks, two are gray water and one is black water.

Does this unit have the rear bathroom?
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Old 02-18-2017, 03:11 PM   #11
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Originally Posted by Pastorjaye View Post
Sorry to be so dense. Thanks for the replies. If I have to either get a Y connector or connect the hose separately, why does the sewer connection have a black water and gray water valve?
My rig also has 2 hose connections and I have 1 black and 2 grey tanks. In my case 1 black and 1 grey go to one hose connection, the other is grey only. This seems likely for you because, based on your pictures, it looks like the two hose connections are NOT next to each other. Does your waste sensor display have 2 grey tank displays???
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Old 02-18-2017, 03:22 PM   #12
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Thanks. So what does that mean when emptying i need to connect the hose to each?

Move the hose, get a "wye", or if it's gray only- replumb the camper to divert the water to the single sewer connector.

I have a "wye" and wrote about it here:
http://learntorv.com/my-camper-has-two-sewer-hookups/
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Old 02-18-2017, 03:27 PM   #13
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Your sewer connection looks like it has grey and black. Probably from the bathroom. The waste connection is grey only, probably from the kitchen.
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Old 02-18-2017, 04:18 PM   #14
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Ford Idaho is on to something. You have a rear bath and a mid kitchen. You prob have more then one grey tank and it has to be plumped separate to work correctly. No big deal you just have two outlets instead of the normal one.

I have friends that have a joint dual outlet like normal then they have to pull forward and drain a second one for their rear kitchen.
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Old 02-19-2017, 10:50 AM   #15
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The OP might only have one dump pipe. No Y connector needed.

My 18ft Shasta has one pipe. There are pull handles on either side. One with waste designation and one with sewer designation. I attach one bigger diameter hose, - not a garden hose; you might have received one "sewer hose"when you bought your TT - to that pipe. It usually has a push on and turn fitting. The other end goe in the drain at the dump station. I pull the sewer handle first, close it, then pull the waste water handle. Once empty, unhook the one hose, rinse with the non potable water hose (like a garden hose) connectied at the dump station, and stow the dumping sewer hose.
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Old 02-20-2017, 11:33 AM   #16
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My dad's trailer has the same setup as the OP. When setup somewhere for a while, he uses the Y adapter with a total of 3 hoses. When traveling and moving a lot, he just uses one hose and moves it as necessary. He and I are both big fans of the Gorilla hoses.
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Old 02-20-2017, 11:53 AM   #17
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Looking at your floor plan, you have the toilet (black tank) and bathroom sink/shower (grey tank) in the rear behind the axles and the kitchen sink (another grey tank) in the front of the axles. So the connection at the rear of the trailer is the black tank and bathroom grey tank and the connection in the front of the trailer is the kitchen grey tank (usually called a galley tank).

Some folks have done a mod to connect the galley tank with the grey tank, but it's not always possible depending on the exact layout of axles and frame. See here:

Connecting 2 grey tanks
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Old 02-24-2017, 09:06 PM   #18
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Hello. So I too have a Shasta 25rs 2016 and have the same set up. I hook up the black hose to the back of trailer and hook it up to park sewer. The front outlet is for the kitchen waste water and I switch the hose from back to the front when ready to dump it. I think this year I will buy a hose for the front for its own dumping.
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Old 04-19-2017, 11:24 AM   #19
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We have A V-Lite with a front kitchen and have 2 grey water tanks because of it. Just dump 1 then the other.
For the OP, make sure when you are at a full hook up site, you wait until leaving to open up the sewer. You can leave the other valves open just wait until full or leaving to dump the sewer. If you open it up all the time, the water will get out but may leave some of the solids.
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Old 04-19-2017, 02:02 PM   #20
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We have A V-Lite with a front kitchen and have 2 grey water tanks because of it. Just dump 1 then the other.
For the OP, make sure when you are at a full hook up site, you wait until leaving to open up the sewer. You can leave the other valves open just wait until full or leaving to dump the sewer. If you open it up all the time, the water will get out but may leave some of the solids.
Agree on your black tank advice. Disagree on your grey tank advice. You want to leave your grey closed (at least as you get close to leaving the site) so it will have enough in it so that AFTER you dump the black tank, you can dump the grey tank and thereby flush the black water and any poo out of the sewer hose at the same time.
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