Does It Matter What Direction The UniGuard Waterless P-Trap Is Facing?
Updated 04/02/2026 | Published 09/01/2025
Question:
when used horizontally is there a spicific side that needs to be on the top I have one installed in my camper horizontally and the foul odor comes in when the dryer turns on.
asked by: Richard H
Expert Reply:
Hello Richard, thanks for reaching out. The UniGuard Waterless P-Trap for RV Sewer Systems # LSB24FR can be installed vertically, horizontally or anywhere in between. The main part of the trap has a silicone bladder, and it does matter which way the bladder is facing. You want the open end of the bladder closest to the water source. That way it opens when water is flowing thru and then closes when the water stops. This prevents odor from coming back up the pipe. Take a look at the picture I included. It shows the opening in the bladder, and you can kind of see how it works. Basically, the way his finger is pointing is the direction you want the water to flow. It would not matter which part of the bladder is on top or bottom necessarily, as long as it is facing the right direction.
I hope this helps.
Let me know if there is anything else I can do to assist.
(click to enlarge)
Richard
4/2/2026
Jesse, thanks for above answer about the direction that the uniguard should be installed. My question is for horizontal installation how should the uniguard be oriented, with the “closed” end of the bladder at the top or bottom? I would think bottom but can you confirm please and thanks! Richard
Jesse M.
4/2/2026
Product Page this Question was Asked From
UniGuard Waterless P-Trap for RV Sewer Systems - 1-1/2" Hub - Polypropylene - White
- RV Sewer Hose Fittings
- Sewer P-Traps
- P-Traps
- Hub
- Sewer Pipe to Sewer Pipe
- 1-1/2 Inch Diameter
- LaSalle Bristol
more information >
Featured Help Information
Instructions
Continue Researching
- Q&A: What Replacement Converter Do I Need for a Series 7300 Model 7345 Converter?
- Q&A: Recommended Replacement for a Atwood Model 35 21 Inch Range
- Q&A: Replacement RV Microwave for High Pointe EC942K9E
- Article: Trailer Lighting Requirements
- Q&A: What Can Help Control the Bouncing and Shaking Seen on Hitch Mounted Cargo Carriers
- Q&A: Installation Difficulty and Hitch Recommendation for 2021 Toyota RAV4
- Q&A: Replacement Wall Control Remote For MaxxAir Vent Fan 4951
- Q&A: Replacement Electrical Cord For 6 Gallon Hott Rod RV Water Heater Conversion Kit
- Article: How Your RV Water System Works: A Complete Newbie's Guide
- Article: Performance Chips and Modules
- Article: What are the Common Types of Propane Fittings Used on RVs?
- Article: Converting Your RV Water Heater to Tankless
- Article: Breakaway Kit Installation for Single and Dual Brake Axle Trailers
- Article: 5 Reasons to Convert Your RV Lights to LEDs Today
Jesse M.
9/29/2025
Hi Richard, did adjusting the direction of the silicone bladder in your UniGuard Waterless P-Trap help with the odor issue in your camper? I'm asking because your experience could be really helpful for others dealing with similar problems.