In plumbing, a trap is a U-shaped portion of pipe designed to trap liquid or gas to prevent unwanted flow; most notably sewer gases from entering buildings while allowing waste materials to pass through. In oil refineries, traps are used to prevent hydrocarbons and other dangerous gases and chemical fumes from escaping through drains. In heating systems, the same feature is used to prevent thermo-siphoning which would allow heat to escape to locations where it is not wanted. Similarly, some pressure gauges are connected to systems using U bends to maintain a local gas while the system uses liquid. For decorative effect, they can be disguised as complete loops of pipe, creating more than one U for added efficacy.
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In this Dossier
Trap (plumbing) in the context of Garbage disposal unit
A garbage disposal unit (also known as a waste disposal unit, food waste disposer (FWD), in-sink macerator, garbage disposer, or garburator) is a device, usually electrically powered, installed under a kitchen sink between the sink's drain and the trap. The device shreds food waste into pieces small enough—generally less than 2 mm (0.079 in) in diameter—to pass through plumbing.
Trap (plumbing) in the context of Flush toilets
A flush toilet (also known as a flushing toilet, water closet (WC); see also toilet names) is a toilet that disposes of human waste (i.e., urine and feces) by collecting it in a bowl and then using the force of water to channel it ("flush" it) through a drainpipe to another location for treatment, either nearby or at a communal facility. Flush toilets can be designed for sitting or squatting (often regionally differentiated). Most modern sewage treatment systems are also designed to process specially designed toilet paper, and there is increasing interest for flushable wet wipes. Porcelain (sometimes with vitreous china) is a popular material for these toilets, although public or institutional ones may be made of metal or other materials.
Flush toilets are a type of plumbing fixture, and usually incorporate a bend called a trap (S-, U-, J-, or P-shaped) that causes water to collect in the toilet bowl – to hold the waste and act as a seal against noxious sewer gases. Urban and suburban flush toilets are connected to a sewerage system that conveys wastewater to a sewage treatment plant; rurally, a septic tank or composting system is mostly used.