The OTR Sealing Washer is designed to provide reliable sealing under extreme conditions. Its components are oil, corrosion and UV resistant, making it ideal for outdoor use. The rubber washers and O rings provide an excellent seal due to their flexibility and ability to prevent any air or outside moisture from entering the closed system. This washer is durability tested to ensure its reliability and performance in any environment. FleetPride is your First Click in Heavy Duty®.