Circular Connector, Ecomate C016 Series, Cable Mount Receptacle, 4 Contacts, Screw Socket, Threaded. The C016 20D003 100 10 from Amphenol is an ecomate circular female cable connector with 3 + PE contacts. The ecomate series provide easy operation, reduced dimensions, robust design, quick and easy assembly. This connector’s main area of application is in the field of plant construction and machine building.