The Amphenol 112713-10 is a BNC dust cap, designed to cover the mating end of a BNC plug when the connector is not in use. It is built with a brass body and a nickel finish, giving it the same corrosion resistance and RF shielding continuity as the connectors it protects. The cap includes a retaining chain, so it stays tethered to the cable or bulkhead and doesn't get lost during field service or test rack reconfiguration.
This dust cap is specifically for use with BNC plugs. It snaps over the plug's bayonet-lock interface, protecting the centre pin and dielectric from dust, moisture, and physical damage during storage or when the cable is disconnected. The silver colour matches the standard finish on most BNC plug bodies.