WT Smith's Service Sewer and Drain Rooter

Request For Service Form

On each page of my website is a "Request for Service form".  This is essentially an emergency service.  By that I mean, contact me when you are ready for me to come address your problem.  Whether the problem is a clogged pipe or underground pipe location, fill out the service request form.  I will immediately be notified via text and will contact you by phone to access your problem in an effort to insure my service will help.  At that point I will give you an idea of how long it will take me to arrive.


Venting influences how well a drain works and questions come up from time to time so I thought I’d post an explanation to which my customer can refer.

*This explanation likely wouldn’t hold up if you look too closely, but I believe it will get the notions across.

The basics.  Remembering that water flows down hill, let’s imagine a column of water filling a section of waste pipe. As it travels down the pipe, it pushes the air in front and sucks air behind it. Vents are placed in the system to relieve these pressure changes.

What’s the problem? If you connect a small drain pipe into a larger sewer pipe, that drain pipe does two things. One is to have a path to get rid of waste water and the other is to act as a vent. The problem is that empty waste pipes allow sewer gasses into your home.

How to fix the smell. The answer is to continue the vent pipe through the roof where you don’t care if it smells.

How to get rid of waste water.  Let’s drain the waste water through a pipe connected to the vent pipe. In that drain pipe, let’s create a dip that holds or traps water and blocks the smell when the piping system is empty. You will find an example under your kitchen sink.

Basically that’s it!

Why is this important? Waste piping systems that are not vented effectively can make gurgling and gulping sounds as the unvented air tries to escape or enter the system through trapped water. The trapped air can compromise how well water flows through pipes. Without any drains or vents to equalize the pressure, the air and water have to travel in the same pipe in opposite directions. That can limit how well things work.

What is a Studor vent?  A Studor vent is a brand name for an air admittance valve. For example, if you have a sink in a kitchen island where you don’t have a wall to hide a vent pipe, an air admittance valve can help, some. The vent pipe is cut off below the top of the sink with an air admittance valve screwed on it like a cap. The valve allows air in the vent pipe but doesn’t let air out so it’s not as functional as a true vent but you don’t smell sewer gas in the house.

What is an “S” trap?  These configurations happen when a drain does not connect to a vent pipe. The pipe comes down turns up and back down again. If you cock your head to the side it kinda looks like an “S” shape. Not only does it invite all the problems of a non-vented drain but there can be an added problem. If water is able to fill the pipe as it leaves the “S” trap it can create a siphon effect and empty the trap. Then if you smell sewer gas, you need to run just a little water in the sink to fill the trap.

Again this explanation would likely not be considered accurate from a Thermodynamics or Fluid Mechanics perspective but I hope it helps!