Sewer gas
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Sewer gas is a complex, generally obnoxious smelling mixture of toxic and nontoxic gases produced and collected in sewage systems by the decomposition of organic household or industrial wastes, typica
An old sewer gas chimney in Stonehouse, Plymouth, England, built in the 1880s to disperse sewer gas above residents
The cover of an 1882 issue of The Wasp, with an illustration linking sewer gas and disease
Trap (plumbing)
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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 throu
Sewer gas
…due to their odor, health effects, and potential for creating fire or explosions. Sewer gas is typically restricted from entering buildings through plumbing traps that create a water seal at potential points of entry. In addition, plumbing vents allow sewer gases to be exhausted outdoors. Infrequently used plumbing…
Water seal in drain pipe under a sink. Water enters at right, fills the trap, and continues left. Inverted siphoning occurs below the line "A".
A bottle trap, which can be unscrewed for cleaning
Wash-out closet, manufactured by Myers Sanitary Depot, New York, 1890
Trap with copper drain pipe at underside of firestop packing in two-hour fire-resistance rated concrete floor slab