A multi-circuit protection valve and an air dryer make up the two-part K043840N00 - ZB4638 Air Processing Unit air processing unit (APU). It will clean and dry the air that the compressor supplies in addition to providing overload protection and pressure adjustments for each of the load circuits. Secures each load circuit's pressure in relation to the other load circuits and the environment. In the case of a circuit failure, will maintain the proper amount of pressure in the other circuits.
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