Aeroquip FCM2091 Blue Anodized Aluminum Bulkhead Union Adapter Expertly designed and manufactured for exceptionally high quality Allows you to connect three lines, or add a branch to a line, through a partition Tee style adapter has three openings -- the "run" across the top is -03 on both ends, while the "branch" is size -03 bulkhead Manufactured from high-quality blue anodized aluminum to be durable and lighter in weight 1 year limited manufacturer's warranty