Soap Dish

Each of these plumbing fixtures has one or morewateroutlets and adrain. 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 aflood 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 (U.S.) or 10 or 12 mm diameter (Europeand Middle East), which connects the water supply to the fixture, sometimes through a flexible (braided) hose. For water closets, this tube usually ends in a flat neoprenewasher 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 soldered or 'fast joint'ed directly onto the water supply pipes.