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The Polarstar JACK replaces the original gearbox components with a programmable pneumatic system allowing for higher performance and greater reliability over a gear driven system. This unit comes with everything you need, from the wire harness, to the triggerboard, to the FCU. The JACK is a very affordable option, while still retaining the same performance and quality you have come to expect from other PolarStar products. The JACK™ has only one moving part, the nozzle, which acts as its own poppet valve.