Industrial form: For use with terminal industrial connector version of the 15 mm valve, and MME-31, MME-41 valves with DIN connector.
DIN 43650 form B: For use with MME-32, MME-33, MME-34, MME-42, MME-43 and MME-44 valves with DIN connector.
DIN 43650 Form C: For use with DIN form C 15 mm valves only