The Vintage Air Streamline 4-Way Diamond Bulkhead Plate mounts through the firewall in a diamond 4-port pattern for A/C and heater hose lines. This 388600-MBA version is polished aluminum with a #6 AN male O-ring port and a #10 AN male O-ring port, and needs only four individually drilled holes to install.
Installation Instructions (PDF)
California Proposition 65 Warning
Specifications:
- Type: Streamline 4-way diamond bulkhead plate
- Ports: #6 AN male O-ring, #10 AN male O-ring
- Material: Aluminum
- Finish: Polished
- Application: A/C and heater hose lines
- Part Number: 388600-MBA
FAQ
What is the Vintage Air 388600-MBA bulkhead plate used for?
It mounts through the firewall to pass A/C and heater hose lines from the engine bay to the evaporator, using a diamond 4-port pattern with #6 and #10 AN male O-ring fittings.
What finish does the 388600-MBA come in?
This bulkhead plate is finished in polished aluminum.
How many holes does installation require?
The lower-profile design requires drilling four individual holes through the firewall.
Does the 388600-MBA include installation instructions?
Yes, Vintage Air provides a printable installation instruction sheet for this part.

