Pipe-clamp. A device for connecting one pipe to another without cutting the pipe and inserting a tee; a pipe-saddle performs the same office as the above, but for larger pipes.
Pitcher Pump. A hand pump which takes its name from the shape of its discharge.
Plug-valve. This is a tapering plug which turns in a shell, example, the plug of a faucet. See [Cock.] A fire-plug is a street hydrant to which a hose may be attached.
Plumb-bob. This is a device for testing whether anything stands exactly vertical; a plumb-rule contains a plumb-bob.
Pressure-reducing Valve. A valve for reducing high boiler pressure to low pressure, for steam heating, etc.
Priming. To fill a pump with water when it refuses to lift of its own action, is called “priming the pump.”
Pump-brake. The handle or lever by which a pump is worked.
Pump-box. A cap or case covering the top of a pump; the casings of the upper and lower valves are the upper and lower pump boxes.
