An accessory kit sold with jet pumps. Can consist of ejector, extra nozzles and venturis, bushings and reducers, pipe adapters and foot valves, and packing leathers. Also known as Ejector package or Injector package.
JET PUMP
A centrifugal pump used in conjunction with an ejector to provide higher pressure.
JTU (JACKSON TURBIDITY UNIT)
A visual means of measuring water clarity based upon the amount of light passing through a tube of water.
JUMP BOARD
A mechanism that has a coil spring, leaf spring or comparable device located beneath the board which is activated by the force exerted in jumping on the board.