JLG Parts Telescopic Cylinder for use on JLG 600 Series Boom MEWP(Mobile Elevated Work Platform) Machines. This Cylinder extends the Fly Boom Weldment to extend from the Mid Boom Weldment. It has a retacted length of 18.8' and a extended length of 32.8'. The Dual Holding Valve assembly will be included. Model Use: 600S, 600SC, 601S, 660SJ, 660SJC.