Plumbing Terminology - E

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | Y

Eccentric reducer

An eccentric reducer is useful at the suction side of a pump system when the fluid the pump drives could contain another substance with different density, for example, water with air bubbles or oil with water. The purpose of the eccentric reducer is to properly mix substances that have different densities to reduce variations in the pump system.

Elbow Fitting

And elbow fitting or ell is a plumbing fitting installed between two lengths of pipe or tube allowing a change of direction. The name comes form the shape of the fitting, it is shaped like an elbow with two openings that changes the direction of the line allowing water to flow in a curve.

Emergency stop valves

An emergency stop valve, or straight stop valve, is valve that does not change direction. They are usually installed before the water supply line (below) to toilets and faucets. Angle stops are to be shut off in case of an emergency or repair and are generally not designed for daily on and off usage. The difference between a straight stop and an angle stops is the angle stop changes direction by 90 degrees while a straight stop is like most valves and does not change direction.

End Bell

An end bell or end bell fitting is attached to one pipe end to provide a socket or bell into which another pipe end can be fitted.


Plumbing equipment, not present in all systems, include, for example, water meters, pumps, expansion tanks, backflow preventers, filters, water softeners, water heaters, wrenches, heat exchangers, flaring pliers, gauges, and control systems.