Miller Electric Mfg. Co.’s Big Blue 450 Duo CST is a dual-operator diesel engine-driven welding generator featuring two CST 280 Stick/TIG inverters and 12,000 watts of continuous three-phase power in a single unit.

Tier 4i compliant machine is powered by Mitsubishi’s S4L2 4-cylinder diesel engine, operates at 1,800 rpm, and allows two welders to work off the same machine with two separate welding outputs