Aeromotive bulkhead fittings give you added peace of mind when running fuel lines through frame rails, body panels, or the firewall. These fittings are also used with fuel cells, providing an excellent fit to reduce the possibility of leaks. They are constructed from 6061 T-6 billet aluminum or stainless steel, CNC-machined for perfect fitment and incredible flow. Aluminum pieces are anodized in black Type II bright dip for protection.