bing tracking image
  1. RV Waste Valves
  2. Valterra
  3. Double Waste Valve - Manual
  4. 3 Inch Hub
  5. Rotating Valve
  6. Sanitation Tee
Double RV Waste Valves - Sanitation Tee - Rotating - 3" Hub and 1-1/2" Hub

Double RV Waste Valves - Sanitation Tee - Rotating - 3" Hub and 1-1/2" Hub

Item # T18
Our Price: $45.17
You Save: 26%
RV Waste Valves
Add to cart
In Stock
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Customer Photos


Need help with installation?
Locate installers near me
RV sanitation tee combines rotating black-water and gray-water waste valves. 3" Hub slides over black-water line. 1-1/2" Hub slides over gray-water line. Bayonet cap fits over 3" lug fitting that connects to your sewer hose. Great Prices for the best rv waste valves from Valterra. Double RV Waste Valves - Sanitation Tee - Rotating - 3" Hub and 1-1/2" Hub part number T18 can be ordered online at or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (42)
  • Q & A (0)
  • Videos (1)
  • Photos

Valterra RV Waste Valves - T18

  • Double Waste Valve - Manual
  • Valterra
  • 3 Inch Hub
  • Rotating Valve
  • Sanitation Tee
  • 1-1/2 Inch Hub

RV sanitation tee combines rotating black-water and gray-water waste valves. 3" Hub slides over black-water line. 1-1/2" Hub slides over gray-water line. Bayonet cap fits over 3" lug fitting that connects to your sewer hose.


  • RV sanitation tee combines a 1-1/2" waste valve and a 3" waste valve
    • Can be used as a replacement part or to upgrade your existing setup
  • T-configuration merges the flow of waste from your black-water and gray-water tanks
    • Valves are perpendicular to each other
  • Rotating valves offer easy access at mounting location
    • Position each valve at desired angle during installation
  • 3" Hub slides over your RV's black-water line
  • 1-1/2" Hub slides over your gray-water line
  • 3" Lug fitting allows you to connect to bayonet fitting on sewer hose
  • Bayonet-style cap covers lug fitting when not in use
    • Integrated strap keeps cap connected to valves
  • Durable black ABS plastic construction
  • ABS solvent cement (sold separately) required for installation
  • Gray and black handles for easy identification of valves
  • 1-Year warranty

Valterra sanitation tee in use

This RV sanitation tee with double rotating valves is a part of your motor home's waste management system. The T-configuration combines the flow of wastewater from your gray-water tank and your black-water tank. And the valves can be rotated as desired during setup to make it easier to reach them. Connect your sewer hose to the 3" lug fitting on the sanitation tee and open the valves to drain your holding tanks.

T18 Valterra Motorhome San Tee w/ Double Rotating Valves - 3" Hub x 1-1/2" Hub x 3" Bayonet Cap

Video of Double RV Waste Valves - Sanitation Tee - Rotating - 3" Hub and 1-1/2" Hub

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Valterra RV Sewer - Waste Valves - T18 Review

Today we're going to take a look at the Valterra RV Sanitation Tee with the double rotating valves. This is made of a durable hard plastic construction. It is designed for a black water and a grey water connection. They call it a Sanitation Tee. The Tee design is how the tubing runs, you can see this way and that way. It does have a 3-inch bayonet end right here, and this is designed for use with the included bayonet cap that's attached, or it can be connected to a drain hose with a bayonet fitting. The bayonet fitting basically means, you can see it has the 4 pins right here, and on either the cap or the hose that you attach will either have 2 hooks or 4 hooks.

What you do is just put it over there, and then when you twist it, you'll notice that those hooks grab those pins and hold it in place, give you a nice secure connection. The 3-inch waste valve body right here is a Bladex design. It's used to open or close the tube opening. If you notice here, when I pull up on the handle it'll open it, push down, it'll close it. This is on the black water end. Now I'll have a 1.5-inch, on this end you can see, there's a 1.5-inch waste valve body also.

It is a Bladex design, it's used to open or close the tube opening on the grey water end. You can see, open it or close it. Both of those can be rotated, that's why they call this a double rotating valve. Basically what that means is when you go to hook up your tubing and your tubing hooks up in a way to where maybe one of these valve handles is in a location that you can't access, what you can do on either one of these is remove the nuts and bolts. When you do that, you can rotate that handle 90 degrees in different positions to where you can make that handle very easy to access.

They are rotating, you can rotate them. Now both valve bodies have metal valve shafts, you can see when we open them. There's the metal valve shafts, they do have plastic handles on each end. I do want to give you a few internal dimensions. We'll start on the black water end. The internal dimension right here is 3.5 inches.

Now on the bayonet end, go ahead and twist the cap off, and the internal dimension on that is going to be right at 3 inches. Go ahead and put the cap back on. Then on the grey water end, the inside internal dimension is going to be right at 1 and 15/16. That should do it for the review on the Valterra RV Sanitation Tee with the double rotating valve.

Customer Satisfaction Score:

Customer Reviews

Double RV Waste Valves - Sanitation Tee - Rotating - 3" Hub and 1-1/2" Hub - T18

Average Customer Rating:  4.9 out of 5 stars   (42 Customer Reviews)

RV sanitation tee combines rotating black-water and gray-water waste valves. 3" Hub slides over black-water line. 1-1/2" Hub slides over gray-water line. Bayonet cap fits over 3" lug fitting that connects to your sewer hose.


My 2013 27/20 Trailmanor camper had separate discharges for gray water and sewage and I bought this to combine both discharges. It works fine as it has in previous TrailManor models prior to them going to separate discharges.



No problems at all, valve works very well


The previous owner did some very odd plumbing. I don't think they ever heard the saying that 'stuff only runs downhill'. For some unknown reason they put a 45 deg angle on the exit pipes which turned the waste valves pointing up. This new waste valve and some new junction pieces was just the ticket to get my rig back and draining properly. Valve was easy to position and install.


Product works as intended, easy installation. If you are mounting on an older camper, beware that the manufacturer used steel bolts that rust. you don't want to snap off the plastic valve flange when installing. Other than that, product works beautifully.

Steve Y.


Excellent. I would agree with George Jthe original bolts can be a problem if they are rusted mostly likely they aresome may need to be hacksawed off, so be careful. If you can get the old off cleanly, its a perfect fit as far as assembly and installation.


You guys did a wonderful job !!
your easy website to the outstanding young lady I talked with about my order. WOW !!!! the order was exactly perfect and in the time frame it was promised.. great job!!


Did a replacement of my grey and black water stopper valves. The seal of the black tank started leaking. So I purchased the new one came fairly quick. It was easy to replace doing all the work myself. Only taking up one afternoon of my time. I’m liking the ease of operation. I’m very happy with it’s turn out. Thanks


Not quite what I was expecting based on the photos (1-1/2" inlet attached to 3" drain fitting slightly different than the old part) but it bolted up just fine, and as an added bonus the black tank 3" valve does not appear to leak like my old one did right from the factory.


I am extremely pleased with the waste value i ordered from etrailer. It arrived on scheduled delivery date. For some reason UPS transferred the package to my local USPS instead of delivering it themselves, so I did have to pick it up since it was to large for our mailbox.


My previous valve assembly was damaged when the temperature at Elk camp dropped below 20 degrees. This new valve bolted right on and stopped the dripping that was happening. The best part is that it survived the 2020 Elk camp!


The product was great. Even though I don't know about plumbing the description and video tell you the measurements. But I didn't realize the 3" pvc pipe for fit directly into it. And I needed a 2" coupler for the 1 1/2 side. But once I figured that out it was quick repair for my vintage trailer.


Had a blowout that wiped out the grey/black dump valves, along with a lot of other damage. This is a simple direct replacement for the 10 year old OEM installed valves. Saved lots of time & money. The rep at e/trailer (angela k.) was awesome to work with.


This was shipped very quickly, and the price was great. Comes with both the large and small "input side" flanges, which I didn't actually need because it was a replacement for an existing valve set, but then you get all the new screws and gaskets too. Simple to replace my existing valves, where were cracked and leaking from road abuse.

Thanks etrailer!


Heavy duty valves, it is a Valterra product. I’ve installed every kind of waste valves made and now we use Valterra exclusively.


This is a fantastic valve. It fit perfect. no modifications.


Good product and good pricing. Staff was responsive and respecful. I will be using ETrailer again. Product is made well.


The dual valve is exactly what I needed. It is identical to the OEM valve that came with my RV. I am very pleased with the overall quality and the speed with which the part was shipped to me!


Product was as advertised and an exact replacement


have not had a chance to install yet. however looks good as a replacement.


This thing still works great after a year of use. It was easy to install and the slides are still smooth and easy to use. Thanks for a great, reasonably priced product.


Part was correct and good quality. It took 15 days to get part from the day I ordered it. It was over a week before it was shipped. That delay was longer than anyone else I deal with. If there was a problem I should have been notified.


Excellent quality, fit great works perf ect.


This service valve is exactly what I needed. The price was right. Service was excellent.


Excellent product, worked very well.


was able to help my customer when it came in


The product works correctly.


Very good quality valve.

Show More Reviews

See what our Experts say about this Valterra RV Waste Valves

  • Differences Between Valterra Double RV Waste Valves T18, T18A, and T18C
    The differences between the three Double Waste Valves you mentioned comes down to the differences between hubs and spigots for their fittings. Hubs fit over spigots. The part # T18 has a 3 inch hub and a 3 inch spigot. The part # T18A has a 3 inch spigot and a 1-1/2 inch hub The part # T18C has a 3 inch hub and a 1-1/2 inch spigot.
    view full answer...
  • Replacement Double Waste Valve For A 2006 Four Winds Class C Motorhome
    The Double RV Waste Valves # T18A has a 1-1/2" spigot so you'd have to also pick up a coupling # 344633001 in order to attach it to the existing pipe. Instead I recommend the Double RV Waste Valves # T18, which comes with hub fittings so you can easily slide the existing pipes into the hubs and won't need another adapter fitting. With how your setup looks you'll most likely need to cut the 3" pipe back just a bit to fit a new double waste valve in place correctly but you'll want to be...
    view full answer...
    Image 1 for
  • Will Double RV Waste Valves # T18 Fit 1988 Thor Citation 35 Camper
    From the pictures that you sent in the Double RV Waste Valves # T18, which has a 3" hib and a 1-1/2" hub will be a direct replacement for your 1988 Thor Citation 35 camper. A review video has been linked for you to check out as well.
    view full answer...
    Image 1 for Image 2 for
  • Dimensions of Valterra Double RV Waste Valves
    As you can see from the accompanying photo the Double RV Waste Valves # T18 the distance from where the valve hooks up to the black water tank to where you hook up the sewer drain hose is 7-1/2".
    view full answer...
    Image 1 for
  • Recommended Black Water Drains Transitioning To 4 Inch PVC Pipe
    To connect your RV to a 4 inch PVC pipe, I recommend the EZ Coupler 4-in-1 Threaded RV Sewer Adapter with 90-Degree Elbow Fitting - Clear # F02-3112CL. This adapter will transition from the standard 3 inch RV black water connections to the threaded 4 inch PVC. For your 3 inch connections, you may be interested in the Camco RV Sewer Hose Straight Adapters w/ Bayonet and Lug Fittings and Clamps # CAM39543. To get your two lines into one, you may want the RhinoFLEX RV Sewer Hose "Y" Fitting...
    view full answer...

Do you have a question about this RV Waste Valve?

Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Amy B
Written by:
Amy B
Employee Cody B
Updated by:
Cody B

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.

Product Experts Available Now!
Call 1-800-940-8924