1. RV Waste Valves
  2. Valterra
  3. Double Waste Valve - Manual
  4. Sanitation Tee
  5. 1-1/2 In Hub
  6. 3 In Spigot
Double RV Waste Valves - Sanitation Tee - Rotating - 3" Spigot and 1-1/2" Hub

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

Item # T18A
lowest price pledge
Our Price: $43.90
You Save: 34%
RV Waste Valves
Orders above $50 qualify for Free Shipping
Shipping Weight: 2 lbs
In Stock
Valterra Sanitation Tee - T18A
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" Spigot slides into 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. Lowest Prices for the best rv waste valves from Valterra. Double RV Waste Valves - Sanitation Tee - Rotating - 3" Spigot and 1-1/2" Hub part number T18A can be ordered online at etrailer.com or call 800-298-1624 for expert service.
  • All Info
  • Reviews (17)
  • Q & A (4)
  • Videos (1)
  • Photos
  • Why etrailer?

Valterra RV Waste Valves - T18A

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

RV sanitation tee combines rotating black-water and gray-water waste valves. 3" Spigot slides into 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" Spigot slides into 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.

T85B Valterra Motorhome Sewer Elbow w/ Double Rotating Valves - 3" Spigot x 3" Spigot x 3" Hub Outlet

Video of Double RV Waste Valves - Sanitation Tee - Rotating - 3" Spigot 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 - T18A Review

Speaker 1: Today we're taking a look at the Valterra double RV waste valve. This RV sanitation T combines an inch and a half waste valve and a three inch waste valve. It can be used as a replacement part or as an upgrade for your existing setup. The T configuration merges the flow of waste from your blackwater and gray water tanks. The valves are perpendicular to one another and each valve is able to rotate. The rotating valves offer easy access at the mounting locations.

You can position each valve at the desired angle during the installation.You can see how they can rotate 360 degrees. You can spin each one, that way you can adjust it and get it to where you need it for your application for your setup. It's a really nice design, it's got the nice easy to access T handles, which makes opening and closing each gate very easy. It also features the appropriate internal seals to ensure leak proof performance. This right here is the three inch spigot.

This slides into your RV's blackwater line. Outer diameter edge to edge right here, three and a half inches. This one right here is your inch and a half hub that slides over your gray water line. Inner diameter is one and 7/8 to one and 5/16 of an inch. Then located right here you have your three inch lug fitting that allows you to connect to a bayonet fitting on a sewer hose.

That has an outer diameter of three and a half inches.Bayonet style cap covers the lug fitting when not in use. Also, features the integrated strap to keep the cap connected so you don't misplace it or lose it. The unit itself is constructed of a durable ABS plastic construction. When installing this, you will need to use some ABS solvent cement. That is required for installation and sold separately.

It's available at etrailer.com. Another neat feature I like is that it uses gray and black T handles. That way you can easily identify the valves. So, gray water tank, black water tank. That's going to do it for today's look at the Valterra double RV waste valve.

Customer Reviews

Double RV Waste Valves - Sanitation Tee - Rotating - 3" Spigot and 1-1/2" Hub - T18A

Average Customer Rating:  4.9 out of 5 stars   (17 Customer Reviews)

RV sanitation tee combines rotating black-water and gray-water waste valves. 3" Spigot slides into 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.

- T18A

After damaging our original, this was an exact replacement and easy enough to install using the appropriate glues. The outlet cap is much tighter that the original and really requires a universal oil filter wrench to remove and install.

- T18A

exactly as advertised. both inlets rotate without any modification at all. The construction is solid and the dimensions are accurate. highly adjustable, heating the black tank outlet a bit with a heat gun made this unit slide on like butter. I used two CV joint boot Oetiker clamps of the appropriate size in the black tank inlet, instead of c-clamps.

- T18A

A low driveway wipe out my dump valve. This was a exact copy replacement. I was able to replace the valve body and gate valves without cutting abs pipe. The original slip fittings matched perfectly. I'm very happy with this product.

- T18A

I am Amazed, Must be my lucky day, your plastic assembly made it all the way to CA in a cardboard box, with NO packing, stuffing or any other protection, arriving in excellent condition ! Thanks!

- T18A

Product was exactly what we needed to replace a cracked/leaking valve on our trailer. Easy to install and we are very pleased with the quality.

- T18A

Cannot believe how easy this was - arrived in two days as promised and exactly what we needed. Unfortunately, when moving the trailer to install the fitting, we caught the black water tank on a covered rock. I know - we are very tough on exposed plumbing. Doesn't look like etrailer has those kinds of parts - too bad.

- T18A

Haven't put it on yet but looks good. Fast delivery. Good price I guess. This was easy. I like easy

- T18A

An excellent product! Received it fast and well packaged. What's not to like?!

- T18A

This valve was perfect for the reconfigure of my gray and black tank. With both valves being able to rotate for installation, I was able to get the position I needed. Thanks for the video showing it's features, the ease of ordering and the on time delivering!

- T18A

Worked well. Exact replacement for. Took approx. 20 mins to remove and replace in my parking space. GreT to get the new valves as part of the package.

- T18A

Seems to be made very well, with good quality materials.

- T18A

Fast shipping and great products!

- T18A

Good price for quality parts. Will order again if need to.

- T18A

Fast response! Very helpful and user friendly website.

- T18A

We put it together quickly for like a glove . Shipped in a timely fashion.

- T18A

- T18A


Ask the Experts about this Valterra RV Waste Valves

  • Rubber Grommet Connector Between Black Water Tanks and Waste Valve.
    This is an unexpected configutation with the valve connected directly to the black tank. Nevertheless, it seems that a Valtera # F02-2106 Replacement Rubber Grommet would fix you right up. I think I would spring for some new Valterra # H03-0018 hose clamps. If you find that you have 3-1/2" connections (rather than 3") then the Valterra # F02-2103 coupler will be needed. Otherwise you will be ready for the Valterra # T18A waste valve.
    view full answer...
  • Dump Valve Recommendation for Fitting 3-1/2 inch and 1-1/2 inch Pipe on RV
    So based on the picture you submitted and the dimensions you listed it looks like you need a dump valve that will fit into the 3-1/2 inch pipe (3 inch spigot) and then need a 1-1/2 inch pipe ot fit over your other valve (1-1/2 inch hub). The valve setup that covers that is the part # T18A as it has a 3 inch spigot and a 1-1/2 inch hub.
    view full answer...
    Image 1 for
  • Dual Sewer Valve Replacement for 1997 Hornet by Damon RV
    Based on the picture you sent in you'd need a sewer tee and not a wye since the angle of the two pipes is 90 degrees relative to each other in your picture. For that we have the part # T18A which would match the orientation of your pipes. I attached an install picture that shows it installed on a similar setup.
    view full answer...
    Image 1 for Image 2 for
  • 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...

Do you have a question about this RV Waste Valve?

  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Highest quality rv waste valves for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate rv waste valve information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Jameson C
Expert Research:
Jameson C
Employee Cole B
Installed by:
Cole B
Employee Amy B
Written by:
Amy B

At etrailer.com 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 800-298-1624