This is a PT10MV10-502A2020-S connector manufactured by Amphenol. This is an eighteen contact, field-termination style, MIL-DTL-38999 Series III, circular connector with crimp sockets and rear removable inserts. The contact size is 10-32, and the receptacle on this connector has a bayonet coupling nut. This connector is designed to meet a variety of industry standards, such as SA18, MA, IP67, MIL-DTL-3899 and NAV4.