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.

The result of turbulence within the water (fluids) and the resistance along the inside wall of fire hose or pipe.

Spring action check valve usually used at the lower end of suction hose often incorporating a strainer.

The yarn that interlaces with the warp yarn to produce a woven jacket.

A single continuous strand of indefinite length, such as manmade polyester. Compared to stable fibers such as cotton, a filament possesses extreme length and often may be measured in thousands of yards without a break.

The amount of force required to compress a sample hose, or the amount of force to turn a sample hose around a roller drum.