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J-bar
A stiff, j-shaped tool for reaching an inside door handle.


Jack-knifing
Jargon for position of articulated aerial ladder such that tractor is at an angle to the trailer; provides improved stability when ladder is hoisted, rotated and extended.


Jaws of Life
A Hurst tool. See hydraulic spreader.


Jet siphon
A venturi appliance used for moving large amounts of water from one reservoir tank to another by pumping a small amount of pressurized water into the jet to create a vacuum to move larger amounts of water.