An Union O Ring is used to connect two oil cooler lines together, which allows oil to flow from one line to the other. By connecting the oil cooler lines, the union facilitates the efficient transfer of heat from the oil to the cooler, aiding in the cooling process. The union also provides a leak-proof connection between the two oil cooler lines. Attributes:• For use with 63.5mm outer diameter Tube• Manufactured to precise specifications and is built for durability and reliabilityApplications:An Union O Ring securely connects the oil cooler lines, ensuring a tight and reliable connection.