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1. a rubber suction cup fixed to the end of a rod, used to clear blocked drains
2. a device or part of a machine that has a plunging or thrusting motion; piston



(also ram), a piston that has a smooth generatrix (generating surface) or annular grooves and is substantially longer than it is wide. Plungers are chiefly used in hydraulic machines, where they serve as components of pumps, of hydraulic presses and lifts, of slide valves in hydraulic drives, and of multistage gas compressors.


(design engineering)
A wooden shaft with a large rubber suction cup at the end, used to clear plumbing traps and waste outlets.
(mechanical engineering)
The long rod or piston of a reciprocating pump.

plumber’s friend, force cup, plumber’s helper, plunger

A tool consisting of a rubber suction cup attached to a handle; set over a plumbing trap (or the like) and worked with a pumping action to clear the trap of minor obstructions.
References in periodicals archive ?
The data shows that gamma irradiated plungers had higher levels of extractables, mainly degradation of the physical properties of the elastomer.
Superior to BD/Phaseal in Preventing Syringe Plunger Contamination by Hazardous Drugs
Plunger systems are typically made from halobutyl rubber-based elastomers and can be coated with a fluoropolymer film, such as FluroTec[R] barrier film used by West Pharmaceutical.
The cavity filling stage was studied, using short-shot trials and analysis of data tracing the evolution of injection pressure, runner pressure, and plunger position, at the millisecond time scale.
He did not go for a swim but cheered the plungers on.
Because (at equal transmission ratio) the design of transmissions with UDE will consist of two lines of plungers that makes heavier a rotor and makes its work of more inertial (in comparison with transmission with IFE, which allowing to use one line of elements of gearing).
This is evident in the fact that when the injection plunger is operating and the shut-off valve between the extruder and plunger is closed, the plasticating extruder must be stopped, since the melt has no place to go.
The combination of guiding the stripper plunger in two places and the precision characteristics of the spring cap allows True-Strip to be mounted up to a 15deg angle for mechanical cam applications, resulting in a 30 percent improvement over other conventional mechanical and urethane type devices.
Cummins' tests with fuel injector plungers demonstrated that, with 1% water in the fuel, traditional tool steel plungers could seize in 10 hours or less.
Unilever is pulling the plug on its PG Plunger loose tea concept after sales failed to reach the company's expectations.
The syringes were sealed by closing a microvalve and twisting an adjustable plunger, and the samples were kept at room temperature.
One of Keats' biggest clients is a company with a new design for a typical household item, a toilet plunger.