Projection of a substance into another; such as, projection of a stream of fluid or chemical product at high velocity.

The under reading of an instrument (such as a pressure gauge) with increasing values (pressure is going up) and the over reading with decreasing values (pressure is going down).

A synthetic rubber with excellent ozone, weathering, and acid resistance. Widely used in fire hose to retard abrasion.

Indentation on the inside of a hose coupling in which a rubber gasket is installed to provide the seal between the hose jacket, coupling, and expansion ring.

Engine work capacity. One horsepower (hp) equals 33,000-ft/lb work per minute. (Gross hp is directly off the engine drive shaft; net hp includes power remaining after power to accessories is subtracted.)

Removal of the first (i.e., outside) thread of a female or male coupling to prevent crossing or mutilation of threads. Dimpled rocker lug on female coupling indicates beginning of Higbee Cut.

Pressure due to elevation of water. Equals 0.433 psi per foot of elevation. Back pressure.

A code that indicates the fitness level of a human resource.

The ratio of the input driving element (shaft) to the output element (shaft).

The process by which the tube is bonded 360 degrees around within the jacket.