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Old 05-21-2019, 05:02 PM   #1
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Question Which One? Sewer Wye or Tee?

Just found out the new trailer I am looking at has two dump valves. So . . . I'm gonna need 2 sewer hoses. Does anyone have input on using a sewer wye over a sewer tee. Any pro's or con's to either one please.
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Old 05-21-2019, 07:22 PM   #2
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I looked at it this way: one of those valves is nothing but gray water, and you only need the giant hose for black water. The giant hose is awkward, so why deal with two?

I outfitted the gray-only valve with a bayonet cap that had the additional garden hose connector, and got myself a red gray-water hose for that valve.

Then I bought a new Prest-o-fit blue elbow (an item which I've used for years and swear by) and a male bulkhead garden hose fitting (image). I ported the elbow on the side (where it's a bit off the ground no matter what side of the elbow is down) and installed the hose fitting. (I had to caulk the inside, as the inside surface is a tad Escher).

When I overnight and won't be dumping the forward gray tank, I cap the hose fitting with a brass hose cap. When I am staying for a while and want to hook everything up, I put a female-female hose connector on the elbow and run the red hose to it.
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Old 05-21-2019, 07:59 PM   #3
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Originally Posted by brandonld View Post
Just found out the new trailer I am looking at has two dump valves. So . . . I'm gonna need 2 sewer hoses. Does anyone have input on using a sewer wye over a sewer tee. Any pro's or con's to either one please.

I think the Y provides more options/flexibility. Our Laredo 225MK has the black tank and one on the grey tanks behind the axles. The other grey water tank is ahead of the axles. If you have a long run, it is better to just do that with one hose. I have four sections of hose and two of the accordion hose stands. Seems to work out fine. I store two of the hose sections in the rear bump. Everything else goes in the pass thru. Chris
2019 Laredo 225MK for travel. Bighorn 3575el summer home in Washington, Park Model with Arizona Room for winters.
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Old 05-22-2019, 02:28 AM   #4
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While Ihaven's idea and use of the 5/8 hose to drain the grey tank seems fine at face value, keep in mind that unless your rig has a grey water flush then the build-up of 'settlement' will not be properly removed from the grey tank. It is not a good idea for a permanent install. We too have a cap with a garden hose fitting and have drained grey water away from the RV in a pinch, but it is not a good idea overall. YMMV
Jim in Memphis
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Old 05-22-2019, 02:47 AM   #5
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I would go with the "Y" fitting. My reasoning is based on a quick and unobstructed dump of your Black Water, and then a good flush of your Grey Tank.

A 45 degree route is, in my opinion, better than a 90. You will already have one 90 where you go into the ground. A second 90 would slow solid things down

Good Luck,

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Old 05-22-2019, 05:12 AM   #6
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I basically do what Snoking does with the exception of leaving the galley grey tank valve open. This has to left open because when Keystone built this particular model they thought the purchasers would all be members of "Cirque du Soleil". What the hell were the designers (can't call them Engineers) thinking!

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Old 05-22-2019, 05:44 AM   #7
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I'd use the "Y" for flow reasons stated. Our Raptor 353TS has the back grey water routed to the forward dump line. So the rearward dump line is the back black tank only.
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Old 05-22-2019, 06:14 AM   #8
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I also had 2 valves to contend with on my last 5er. I used the "Y" junction. Worked great.
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Old 05-25-2019, 04:30 PM   #9
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Our 5th wheel has two dump lines, and we use a wye adapter to minimize any effluent flow restrictions. Two years and counting, and we haven’t had any concerns or issues...
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Old 05-25-2019, 06:30 PM   #10
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Personally I would look at re-plumbing the drains to one under the trailer.
Our rear kitchen grey tank drains forward to the dump valve, one hose connection.
Yes, it is a bit of work to do, but only once then you are at a single hose.
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Old 05-25-2019, 07:56 PM   #11
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I'd recommend the Y & connect the 2 dumps as close as possible for better draining. Also with the T some sewer connections are below ground or in some sort of containment that the huge connections on the T would not fit.
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Old 05-30-2019, 04:11 PM   #12
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I use a Wye

I cut two short lengths of sewer hose to come off the
Outlets. They meet at the Wye on a block. Then I run a hose to the sewer inlet. I always drain and flush the black tank first so the galley and gray (in that order) contents rinse the longer hose prior to storage for travel.
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Old 05-31-2019, 03:56 AM   #13
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Sewer Hose

I too use a Sewer Wye because I having 2 dump valve locations on our Laredo FW. It works great. The dump valves are about 15 foot apart from each other. So I installed the 45 degree clear adapters on both on valves, then connect sewer hose extensions to them and they connect to the Sewer Wye. I've learned to make sure the Wye fitting is angle little down hill where the final sewer hose connects to ensure good flow. Easy to clean and maintain.

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