The JLG 600 Series Slave Cylinder Hydraulic Hose Assembly is used on various JLG 600 series Mobile Elevated Work Platforms (MEWPs). The hose is a 3/8 hose that is 858" (71.5 feet) long. It is the hydraulic attachment for the boom slave (platform level) cylinder located at end of main boom assembly. For use on models: 600S, 600SJ, 660SJ, 600SC, 660SJC, 601S. Please verify the proper serial number range for your machine.