Novatron packs and heads now have a 6th pin. If you have an older Novatron power pack with blue connectors for plugging in your flash heads, you need the 4012 5 to 6 Pin Flash Head Adapter for later series flash heads to fit.
Note: This adapter is NOT for use with the 2103-FC Fan-Cooled Bare Tube Head. It requires packs with black connectors.

