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A trap seal is a plumbing term where water creates a seal between the appliance drain and the house piping system, preventing gases from entering the home and creating a siphon effect. Traps are found in almost any building with indoor plumbing, with the U-trap being the most common. The trap seal serves two purposes: preventing bad smells from leaving the pipes and acting as a water siphoning system to make water drain faster and move trapped material at a faster rate.
A trap seal is a plumage term where water is used to both seal a pipe and aid in the movement of water. Traps are found in almost any building with indoor plumbing. The most common style of trap in a home is the U-trap found under nearly all sinks, while the second most common is the P-trap. These traps hold water inside a bent pipe, creating a seal between the appliance drain and the house piping system. This seal prevents gases from entering your home from internal pipes and creates a siphon effect as water flows down the drain.
A trap consists of a handful of areas. The inlet and outlet are the openings where water flows into and out of the system. The cup is the part where the sitting water creates a tight trap. The crown is located at the junction of the outlet and the cup; this is the area where the water almost flows out of the trap, but is impeded by gravity.
Building a trap is what creates the trap’s seal. In a common U-trap, the drain hose from the fixture drops directly into the U-shaped trap. The outlet connects to the other side of the U, allowing water to drain from the fixture. When water doesn’t flow through the U-shaped cup, the water is trapped there by gravity.
This retained water creates the true seal of the trap. Water is a physical barrier between your home and your pipes. This barrier is made of water so it does not prevent the use of the hose. In addition, the water is refreshed every time the water flows through the trap, so there is no odor left behind.
The trap seal serves two basic purposes. Its main use is to prevent bad smells from leaving the pipes and entering the house. Most domestic pipes have a very strong and unpleasant smell. The physical barrier created by the water in the trap prevents indoor air from entering your home.
The second function of the trap is that of a water siphoning system. As water enters the siphon from the inlet, it pushes the water up into the crown. This is enough for water to flow, which draws liquid through the trap. This serves two purposes: It makes the water drain faster and smoother than a simple straight pipe, and it moves trapped material in the water at a faster rate, which makes it less likely to get stuck in pipes.
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