The CIR030GFP-28-21S-F80 from ITT CANNON is rear panel (square flange with non threaded through mounting hole) mount circular connector, receptacle with female sockets, 37 position, shell size-insert 28-21, bayonet lock, backshell (suitable for heat shrink tubing but includes individual wire sealing grommet and compression ring) and crimp contacts. This connector has copper alloy contacts with silver finish, chloroprene rubber insulator and aluminum alloy shell with chromate over cadmium, olive drab plating. Operating temperature range is from -55°C to 125°C.