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
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
Alexander Cumming
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Alexander Cumming FRSE was a Scottish watchmaker and instrument inventor, who was the first to patent a design of the flush toilet in 1775, which had been pioneered by Sir John Harington, but without
Trap (plumbing)
…are typically U, S, Q, or J-shaped pipe located below or within a plumbing fixture. An S-shaped trap is also known as an S-bend. It was invented by Alexander Cumming in 1775 but became known as the U-bend following the introduction of the U-shaped trap by Thomas Crapper in 1880. The U-bend could not jam, so, unlike…
Alexander Cumming Clockmaker
Cumming's 1775 patent for a valve closet with an S-trap laid the foundations for the modern flush toilet.