JLG Parts U-Ring is used in various Skytrak Telehandler(Rough Terrain Forklift) Machines. This U-Ring is used in correlation with the support ring in the ZF Axles Brake Housing and used to seal the piston inside the housing. Model Use: 6036, 6042, 8042, 10042, 10054, 4266, 4270, 4290, as well as select Military Telehandler Units. Please ensure proper model and serial break before parts purchase.