Differences Between The Valterra Double Waste Valve # T18, # T18A, And # T18C
Updated 12/22/2025 | Published 10/21/2024
Products Featured in This Question
Question:
Reference: Differences Between Valterra Double RV Waste Valves T18, T18A, and T18C Not quite understanding the difference between ’SPIGOT’ and ‘HUB’. Please explain to help make my purchase easier. Thanks
asked by: Dirk S
Expert Reply:
Hey Dirk,
I'd love to explain the difference, a spigot is essentially just the male fitting and hub is the female fitting. The spigot will slide into a hub fitting and can be glued in place with some abs cement # A05-0303.
The # T18 has a 3" Hub and 1-1/2" Hub
The # T18A has a 3" Spigot and 1-1/2" Hub
The # T18C has a 3" Hub and 1-1/2" Spigot
Each of these have a 90 degree angle for the gray tank connection to black tank connection so it's important to make sure this design lines up with how your pipes are ran. There are a few other alternatives to look at if this doesn't work. If I don't have to cut the pipes and can just reuse the current fittings that are glued in I'll usually just unbolt the fittings on the new waste valve and bolt it to the old fittings like in the attached video below. If you still have questions just let me know and I'd be happy to help.
Product Page this Question was Asked From
Double RV Waste Valves - Sanitation Tee - Rotating - 3" Hub and 1-1/2" Hub
- RV Waste Valve
- Sanitation Tee
- Double Waste Valve
- 1-1/2 Inch Valve Body
- 3 Inch Valve Body
- Manual
- 1-1/2 Inch Hub
- 3 Inch Bayonet
- 3 Inch Hub
- Rotating Valve
- Valterra
more information >
Featured Help Information
Miscellaneous Media
Continue Researching
- Search Results: rv waste valve
- Shop: etrailer Electric Trailer Jack w/ Tongue Weight Scale - 7-Way - 18" Lift - 5,000 lbs
- Shop: Double RV Waste Valves - Sanitation Tee - Rotating - 3" Hub and 1-1/2" Spigot
- Q&A: Recommended SnapPad Jack Pads for a HWH Leveling System on a Motorhome
- Search Results: rv roof repair
- Search Results: rv sewer hose fittings
- Search Results: dicor rv roof repair
- Search Results: rv plug adapters
- Shop: Trailer Hitch
- Shop: Double RV Waste Valves - Sanitation Tee - Rotating - 3" Spigot and 1-1/2" Hub
- Shop: Double RV Waste Valves - Sewer Wye - Rotating - 3" Spigot and 1-1/2" Hub
- Search Results: tongue weight scale
- Video: What to Know About the Double RV Waste Valves-T80
- Search Results: rv jack pads
- Video: All You Need to Know About the Double RV Waste Valves
- Shop: Double RV Waste Valves - Sanitation Tee - Rotating - 3" Hub and 1-1/2" Hub
- Video: Complete Breakdown of the Double RV Waste Valves
- Shop: Double RV Waste Valves - Sanitation Tee - Rotating - 3" Spigot and 1-1/2" Spigot
- Q&A: Replacement Double RV Waste Valve For a 2015 Nucamp 320s Camper
- Shop: Valterra Rotating Adapter for Rigid RV Sewer Pipe - 3" MPT to 3" Bayonet - Black Plastic
- Video: Choosing the Right Vehicle Suspension Upgrades
- Video: What to Know About the Valterra Bladex Waste Valve Body for RV Black Water Tank
- Video: Valterra Bladex Waste Valve Body for RV Black Water Tank Spec Review
- Video: Double RV Waste Valves-T18A Spec Review
- Q&A: Offset Gooseneck Ball for 2027 Brinkley Z 3610 and GMC 3500 Short Bed
- Q&A: Axle Options For A Light Weight And High Speed Trailer
- Q&A: Replacement Equalizer and Wet Bolt Kit w/ 2-1/4" Shackle Straps for a 13-144 Equalizer
- Shop: Roof Rack
- Q&A: What is the Difference Between the Power Watchdog # HU67FR and # HU42VR?
- Q&A: How to Choose Correct Valterra Double RV Waste Valves Replacement
Jameson C.
12/22/2025
Hey Dirk, how did things go with choosing between the T18, T18A, and T18C waste valves? Your feedback on how the spigot and hub fittings matched up could help others sorting out the same setup.