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Old 11-24-2023, 06:47 PM   #1
Flip
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kitchen sink tank and drain question

Would someone please tell me why a kitchen sink tank and drain is provided and are separate from other stuff when no RV park I have been to has an extra dump station?
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Old 11-24-2023, 07:16 PM   #2
chuckster57
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Often times waste tank placement and drain plumbing is determined by floorplan and space underneath. Having 2 drain points is more common than you think.
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Old 11-24-2023, 07:19 PM   #3
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Likely because it's cheaper to build it that way and rely on the buyer to adapt to whatever sewer drains are available. Once the trailer is sold, that part is no longer Keystone's problem. I'd guess that around 25% of Keystone trailers have two dump ports, one forward of the axles and one aft of them. When we were looking for our current trailer, one of my "must have's" was a single sewer dump port and I wouldn't consider any trailer that didn't have that feature. I'd guess that we said NOPE to probably 15 or 20 "good deal floorplans" in our price range that were excluded on that feature alone. Had the manufacturer added another 10' section of 1.5" ABS pipe to tie the two together, we may have bought something other than the Cougar we have.

That said, in several trailers, depending on the distance between the aft tank valve and the forward dump fitting, there may not be enough height to get the slope drain requirement so the aft gray tank will empty. Water won't run uphill, and if the trailer is slightly nose high, water won't run through what "was a level pipe". So to prevent drainage problems, they simply install two dump fittings so everything drains nicely, even if it is a hassle to run sewer hose to the campground connection.
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Old 11-24-2023, 08:24 PM   #4
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And some of us simply replumbed the drain pipes into one sewer dump. I added a length of 1 1/2" ABS pipe and plumbed the front galley drain into the rear main dump outlet. Not too tough and took a few hours under the rig to make it work.

You can read about my mod with pics here https://www.keystoneforums.com/forum...ad.php?t=54078
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Old 11-25-2023, 04:16 AM   #5
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Been to a few campgrounds with double hookups. About 30% of Mayberry campground has two hookups per site. A few others we have been to have the same.
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Old 11-25-2023, 08:41 PM   #6
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You could get a few extra items that will make this work quite well. Get a five foot drain hose, https://www.amazon.com/Valterra-D04-...07&sr=8-7&th=1
Next get a hose long enough to reach from from the galley drain outlet to the end of the five foot hose when connected to the black/grey tank drain. Last, a wye fitting to connect the two hoses together will complete the setup https://www.amazon.com/Camco-39812-R...s%2C266&sr=8-3
Then you can have this setup while stationary at a park and can also quickly set this up at a dump station.
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Old 11-26-2023, 06:14 AM   #7
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Quote:
Originally Posted by SargeW View Post
And some of us simply replumbed the drain pipes into one sewer dump. I added a length of 1 1/2" ABS pipe and plumbed the front galley drain into the rear main dump outlet. Not too tough and took a few hours under the rig to make it work.

You can read about my mod with pics here https://www.keystoneforums.com/forum...ad.php?t=54078
This is how ours is. Galley drains forward on our rear kitchen unit in a 1-1/2 abs pipe to the main drain. Makes life much easier.
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Old 11-26-2023, 07:08 AM   #8
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Two separate drains are installed, especially on longer trailers, because the distance to join the two together is simply too much. Often times, one is forward of the axles and the other is behind. Getting enough grade fall between the two, working around the main frame beams and all the lesser beams, working around furnace duct work and wiring is simply too much of an effort for the manufacturers.

If you decide to do some self-help plumbing and connect the 2 together, these are the obstacles you have to work around.

Now, you can easily drop the connecting pipe under the cover for the underbelly and have it hanging to clear all those obsticles. But, when driving, there is always the risk of that low hanging pipe hitting something, or something hitting it.

And in cold weather (below freezing), if that pipe is not enclosed in the underbelly, it will freeze up with fluids and such in it. So, in order to do it right, it really should be enclosed inside the underbelly. Otherwise, hanging below, folks would be complaining big-time about what a stupid set-up that is because the pipe is exposed and getting damaged from road obstacles and freezing in cold weather.

So, over all, it's just easier, and the law suits are negate if the simple solution is to connect with 2 valves. THAT is the reason for the 2 valves and why manufactures do it that way.

Now about hook-ups. Here's the easy solution. Of course, Winter camping is an entirely different ball game:



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Old 11-26-2023, 09:52 AM   #9
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The freeze likelihood is negligible as there is little or no water in the line except when dumping. And as for getting hit by road debris the 3" sewer dump itself hangs way lower than the 1 1/2" ABS pipe running parallel to the frame.

And as a matter of the "simple solution" many states and campgrounds have rules or laws prohibiting laying sewer lines on the ground and must be elevated. And the further the dumps are apart the bigger the PITA factor becomes. And if you are staying somewhere for a significant length of time, it may not be an issue but moving and breaking down and setting up every few days is a real chore, especially if the sewer dump connection is higher than the dirt it is set into.

So the replumb is just another option to simplify life for me. And life really is just a series of choices, and is just an exampe of one.
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Old 11-27-2023, 08:00 PM   #10
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THANKS. Still think it was a stupid design issue. Will use this for now but probably do as everyone else on here is doing - just repipe it under the camper and be done with it.
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