Editing Plumbing fixture (section)

===Waste===
<!-- This section is linked from [[Irrigation tank]]. See [[WP:MOS#Section management]] -->
[[Image:Water outlet russia.jpg|thumb|200px|A water outlet]]
Each of these plumbing fixtures has one or more [[water]] outlets and a [[drain (plumbing)|drain]].  In some cases, the drain has a device that can be manipulated to block the drain to fill the basin of the fixture.  Each fixture also has a ''flood rim'', or level at which water will begin to overflow.  Most fixtures also have an overflow, which is a conduit for water to drain away, when the regular drain is plugged, before the water actually overflows at the flood rim level.  However, water closets and [[showers]] (that are not in bathtubs) usually lack this feature because their drains normally cannot be stopped.

Each fixture usually has a characteristic means of connection.  Normal plumbing practice is to install a [[valve]] on each water supply line before the fixture, and this is most commonly termed a ''stop'' or "service valve".  The water supply to some fixtures is cold water only (such as water closets and urinals).  Most fixtures also have a hot water supply.  In some occasional cases, a sink may have both a [[potable]] (drinkable) and a non-potable water supply.

Lavatories and water closets normally connect to the water supply by means of a ''supply'', which is a tube, usually of nominal 3/8 in ([[United States]]) or 10 or 12&nbsp;mm diameter ([[Europe]] and [[Middle East]]), which connects the water supply to the fixture, sometimes through a flexible ([[braid]]ed) hose.  For water closets, this tube usually ends in a flat [[neoprene]] washer that tightens against the connection, while for lavatories, the supply usually ends in a [[conical]] neoprene washer.  Kitchen sinks, tubs and showers usually have supply tubes built onto their valves which then are [[soldering|soldered]] or 'fast jointed' directly onto the water supply pipes.

====Drains====
The actual initial drain part in a lavatory or sink is termed a ''strainer''.  If  there is a removable strainer device that fits into the fixed strainer, it is termed a ''strainer basket''.  The initial pipe that leads from the strainer to the trap is termed the ''tailpiece''.

Floor-mounted water closets seal to the [[toilet flange]] of the drain pipe by means of a wax ring. These are traditionally made out of beeswax. However, their proper sealing depends on proper seating of the water closet, on a firm and secure base (floor), and on proper installation of the closet bolts which secure the closet to the flange, which is in turn supposed to be securely fastened to the floor.<ref>{{cite web |last1=Addison |first1=Riley |title=How to Move a Toilet Drain Pipe |url=https://plumbingadvice.online/how-to-move-a-toilet-drain-pipe/ |website=Plumbing Advice |publisher=Riley Addison |access-date=28 November 2024 }}</ref>

====Traps and vents====
[[Image:Drain cover with trap.jpg|thumb|350px|This drain cover has a container underneath (which can be taken out for cleaning and revealing another container below) acting as a trap. Water inside the container forms a seal when the cover is in place. Positive air pressure will push the cover up, acting as an early warning device. The underside of the cover (centre image) is kept moist by condensation occurring and insects that go back up the drain pipe get stuck to the walls of the cover.]]

All plumbing fixtures have [[Trap (plumbing)|traps]] in their drains; these traps are either internal or external to the fixtures.  Traps are pipes which curve down then back up; they "trap" a small amount of water to create a water seal between the ambient air space and the inside of the [[Plumbing drainage venting|drain system]].  This prevents [[sewer gas]] from entering buildings.  

Most water closets, bidets, and many urinals have the trap integral with the fixture itself.  The visible water surface in a toilet is the top of the trap's water seal.

Each fixture drain, with exceptions, must be vented so that negative air pressure in the drain cannot siphon the trap dry, to prevent positive air pressure in the [[sanitary sewer|sewer]] from forcing gases past the water seal, and to prevent [[methane|explosive sewer gas]] buildup.