A Seal Washer is made of annealed copper, which is a soft and malleable metal. This allows the washer to conform to the uneven surfaces that it is sealing, creating a tight seal. It has a central hole and a larger outer diameter. The washer is placed between the adapter and an oil distributor.Attributes:• Manufactured with Copper which gives excellent corrosion resistance• Manufactured to precise specifications and is built for durability and reliabilityApplications:A Seal Washer is used to create a tight seal between the adapter and the oil distributor to prevent oil leaks during supply.