Stratus ESG GPS coax cable fitting

I'm installing my new Stratus ESG and don't recognise the threaded coax fitting for the gps on the back of the unit and gps antenna. Could someone who has done this install point me in the right direction? Thanks in advance, Roger.

TNC

Threaded connector is TNC.

TNC

Thanks for the response. I need to put in an order with Stein.