CNC machined bulkhead hose adapter. It is machined from aluminum billet and allows water- and airtight pass of the engine coolant through the firewall. The narrow spaced lock plate is designed with a hexagonal cut out that interlocks with the alloy adapters preventing them from from turning when tightening up the nut on the reverse side. The bulkhead fittings and spacer plate can be polished with little effort.
Available in the sizes 1/2″ on the cockpit side and either 1/2″ or 5/8″ firewall forward.