AN Bulkhead Tee.
These AN tee bulkhead fittings allow you to easily and safely run you fuel/oil/water lines through a panel or firewall without worrying about rubber grommets and wearing through the hose. This AN tee-piece has the bulkhead section on the side and all ends are the same AN male flare size. Available in sizes from -3 all the way through to -20.
Bulkhead nuts sold separately
AF834-12BLK