Since a drainage system involves all of these components, it is usually referred to as the DWV: the drain-waste-vent system. Because grease and hair are generally the causes of drain clogs, traps often have clean-out plugs that give you easier access to remove or break up any blockage. Some kitchen sinks have grease traps to collect grease that might otherwise cause clogging.
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However, drum traps aren't up to current code standards anymore. Older bathtubs frequently have drum traps, which not only form a seal against sewer gas but also collect hair and dirt in order to prevent clogged drains. Toilets are self-trapped and don't require an additional trap at the drain. Water flows from the basin with enough force to go through the trap and out through the drainpipe, but enough water stays in the trap afterward to form a seal that prevents sewer gas from backing up into your home.
It is the curved or S-shape section of pipe under a drain. Traps are vital components of the drainage system. Therefore, most fixtures should have individual stop valves. If the emergency, like a leak, is confined to a sink, shower, or toilet, however, you may not want to turn off your entire water supply. Otherwise, when a pipe bursts, it can flood your house in no time. In a plumbing emergency, it's vital that you quickly close the main shutoff valve. The main water shut-off, or stop, valve is typically located close to the meter. As water comes into your home, it passes through a meter that registers the amount you use. It enters your home under enough pressure to allow it to travel upstairs, around corners or wherever else it's needed. The water that comes into your home is under pressure. One subsystem brings freshwater in, and the other takes wastewater out. The plumbing system in your home is composed of two separate subsystems. You can save yourself time, trouble and money!
Knowing this, you can understand its "mysteries" and make dozens of fixes to your home's plumbing system. Plumbing follows the basic laws of nature - gravity, pressure and water seeking its own level. At the fixtures (bridges between the two systems), the air admitted by the vent stack and vent pipes keeps the traps sealed and prevents sewer gases from backing up through the drains. Your home's supply and drainage system must always be two distinct subsystems, with no overlapping.
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