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Learn about drain lines in this segment of Plumbing 101 from the Building Wisconsin TV series taped at Plumbers 75's training center.
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https://www.plumbersstock.com/product/4250/1-1-2in-abs-p-trap/ https://www.plumbersstock.com/product/4240/1-1-2in-abs-center-outlet-waste-kit/ In this video West Harris shows us how to install a P trap with a center outlet waste kit. Installing a P trap is fairly simple and should be easy enough for most homeowners to accomplish with relative ease. This is good news as installing your own P trap could save you a great deal of money. Video Transcript: Today we'll be showing you how to install a P trap under a kitchen sink. A P trap is an ingenious device that traps a small amount of water inside of itself. This water forms a seal that prevents gasses from the sewer from entering your home. We've once again enlisted the help of West Harris in order to get this done. Our installation already has what is called a "stub out" installed onto our sewer line. However, you may need to install a stub out on your own installation. The stub out is simply an adapter that glues onto your sewer line that allows you to use hand tightened fittings rather than glued on fittings. This is important to have since all P traps are designed to be easily disassembled. The next pipe to be installed looks like a long elbow joint called a wall bend and will be fitted inside of the stub out. This will then be followed by the J bend pipe that gives the P trap its functionality. The next piece to be inserted is our tailpiece. You would normally have a tailpiece on both sides of the sink, but in our case we already have a garbage disposal installed on one side. This presents a problem, in a normal installation we could simply install our J bend dead center and the installation would work out fine. However, the position of our garbage disposal makes this impossible to do. To compensate for this, we simply rotate the J bend until it is directly between the garbage disposal outlet and the sink's tailpiece. This creates the straight line needed for a correct installation. The next pipe to be installed is our T adapter, which allows us to attach both drains to the same P trap. After attaching the T adapter, we realized that our P trap is sitting to high; the simple solution is to add an extender above the P trap that would lower our pipes to the appropriate level. As you can see, West is now installing a slip joint pipe with a 90 degree bend on either side of our T adapter. We are using rubber washers on our slip joints to compensate for the vibrations caused by our garbage disposal. These pipes lack the flange that is on the rest of our pipes, which allows us to slide them in and out of our T adapter according to the needs of our installation. If necessary you can cut these pipes for a better fit. And that's it! As you can see, installing a P trap is a simple installation that most any homeowner can accomplish on their own. If this video was helpful, feel free to push the like button, if you want to see more videos like this one be sure to subscribe and as always, thanks for watching.
Watch the full episode: http://www.thisoldhouse.com/toh/tv/ask-toh/video/0,,21002944,00.html
Ask This Old House plumbing and heating expert Richard Trethewey explains several reasons why a trap may be losing water. (See steps below.)
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Steps for How a Plumbing Trap Can Lose Water:
1. If a washing machine drains a toilet, it could be because the system is not vented properly and air is being pulled in through the toilet. One possible solution would be to install an air admittance vent to let air in, but not let sewer gas out.
2. Traps can also lose their water from oscillation, which means too much air from wind outside the house could be getting into the pipes and may bounce the water out of the bowl.
3. An “s” trap could also empty a trap. Those are illegal in nearly every state. The long leg of pipe attached to the trap could be pulling the water right out of the trap due to too much velocity in the water as it moves through the pipes.
4. Capillary action could also be a culprit if something is stuck inside the pipe and it is wicking the water from the toilet bowl.
5. Evaporation is another possibility with the water just evaporating into the air in a dry house.
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