Have clear access to lines and keep hookups tidy while routing through the firewall with JEGS Cooling & Heating Firewall Bulkheads. Available to fit specific applications in 4-port square and 4-port inline styles, as well as a 2-port style. Four-port Bulkheads work with one 5/16" & three 1/2" hose ends. Two-port bulkheads work with one 5/16" & one 1/2" hose ends or two 1/2" hose ends. Crafted from 6061-T6 billet aluminum with a polished or black anodized finish then preassembled to save you time.