Firewall Bulkhead Billet/Clear Aluminum (4)Port Square-(3L/1S)CNC Machined from billet aluminum and anodized. Used to terminate hoses through firewall. Don't let your classic car look ugly under the hood with ugly fittings hanging everywhere. Route your air conditioning and heater hoses through the firewall with this discrete and clean looking bulkhead. Works great on hot rods, rat rods, street rods, muscle cars, vintage Fords, Big Block and Small Block Chevys ad more!Organize your A/C and Heater Hoses and dress up your Firewall for that professional look with this Firewall Bulkhead!Details:Made From Quality Billet Aluminum and Anodized Clear4 Port Square (3L/1S) Bulkhead4 Ports: (1) -6AN (5/8"-18) and (3) -10AN ( 7/8"-14)For Use with 5/8" (#10) and 3/8" (#6) Heater Hose and A/C FittingsWorks Great For Hot Rods, Rat Rods, Street Rods, Muscle Cars, Classics, Customs, and more!