Home Service Blog Articles by Tiger®

All About Sanitary P-traps

Published: October 17, 2019

If you’ve ever looked under your sink, you’ll see that it doesn’t just drain into a straight pipe. There is a u-shaped portion of pipe that is connected to a straight pipe. Leading to the rest of your drainage system in fact, it looks like a “p” lying on its side.

Image result for p-traps

That portion of pipe is known as a p-trap and even though it sometimes interferes with storage space under the sink, it serves a vital purpose for your health.

The purpose of p-traps
The best way to understand the role of p-traps is to consider what would happen without them. After all, they seem like more of a hindrance than anything. Making waste flow through an extra loop before leaving the sink. But a pipe that runs straight to the sewer without traps will allow a free flow of smelly sewer gases back into your home.

P-traps are designed to hold some of the water flowing through them as a barrier between your open drain and the sewer system. Not only does it prevent the rotten smell from entering your house. It keeps dangerous gases like methane from accumulating and making you sick.

P-trap problems
P-traps that are not properly vented can lose their seal through pressure differences that pull the water out, leaving it dry. A dry p-trap is as useful as no p-trap. Hence there is a maximum distance allowed between the trap and the vent stack serving it.

Some drains, like floor drains, are seldom used. The water that seals the trap isn’t replenished and dries out, leaving an open path for sewer gases. To prevent this from happening, you can throw water down the drain at regular intervals, or you can have a professional install a trap seal primer. Trap seal primers provide a controlled flow of water to p-traps via a small tube connected to a supply pipe.

P-traps don’t just hold water. They are also prone to accumulate dirt, hair and other debris going down the drain. Some have clean-outs that can be removed to clear the unwanted gunk while others must be removed completely. To prevent backups, have your p-traps cleared as part of regular maintenance.

If you need assistance with your drainage system and its p-traps, give us a call and we can help keep the smells away.


If you have any plumbing needs, schedule service online, or simply call us at:

(877) 552-2326


You Can Trust Tiger
True professionals
"Brian did an amazing job for us. A true professional!"
- Rob B.
Personable and efficient
"Mark was personable and efficient. I like the pictures he took for an explanation of problems especially since I couldn't get to the area that had the problem."
- Mike H.
We definitely recommend Tiger!
"My families a/c went out randomly today. I went around the house troubleshooting what I could. It got to the point where we had to call someone. We called the first places that showed up on google. Most places either wanted tons of money just for diagnostics, or couldn’t come out today. We called Tiger they went over the cost and they got someone out to our house in 45 minutes. Josh Moravec was our tech and was super professional, kind and intelligent. He was here for about 15 minutes before he figured out our issue. He went over in depth the cost and verified everything was good before getting started to resolve it. There was no pressure to buy the service if we didn’t want to. He went back down and in 15 minutes the a/c was running strong! He asked if we had any questions and then was on his way! He was great with our kids, very polite and courteous of me and my wife. He answered all our questions, and the price was more than reasonable. We definitely recommend Tiger, and make sure you ask for Josh Moravec if you can!"
- James L.
Prompt and ready to help
"Mark came within 24 hours and was prompt and ready to help. He fixed our problem in no time at all! I will be calling them again!"
- Monica J.
Professional electrical service
"We appreciate that Tiger was able to accommodate our appointment request the next day which was a Sunday. Tyler was on time and provided very professional service regarding our electrical issues we had."
- Anne N.
Professional, knowledgable and polite
"Service man was very professional, knowledgeable, and polite. Work was organized and every step taken was toward accomplishment of goal. System was repaired and returned to service promptly. I felt confident in the serviceman's performance and that my AC will work properly...satisfied customer."
- Walter B.
    See how fast we can get to you!


    Join Our
    Winning Team

    Here’s a Little More About Our Heating Services