3/8 Outside Diameter Bulkhead Tube UnionThe 3 8 Outside Diameter Bulkhead Tube Union is a fitting designed to connect tubing with an outside diameter (OD) through a bulkhead or wall. This type of union is used when you need to create a passage for tubing through a partition, panel, or wall while maintaining a secure, leak proof connection. It is commonly used in hydraulic, pneumatic, fluid transfer, and automotive systems where tubing needs to be routed through barriers while maintaining