Radial oil seals is constructed of rubber viton ptfe teflon sealing lip, metal case and a spiralled tensioning spring and an internal case. A2z Seals Oil Seals helping prevent lubricants, hydraulic Oil, water, or chemicals escape. Oil Seal House also prevents the entry of dust and dirt into a machine. They also stop harmful contaminants from entering machinery, particularly in severe environments. Vital components of practically every type of machine and vehicle in operation, oil seals protect all types of precision-constructed, close-fitting ball, sleeve and roller bearings.