CESS BNC Female to Female CCTV Security Camera RF/Coaxial Adapter Connector Coupler Panel Mount (20 Pack) This BNC F/F Panel-Mount coupler designed to mate two male BNC connectors. In particular, this coupler has threading and a mounting nut for securing into a bulkhead, wall plate, or any other panel where a BNC port is desired. Couples devices with male BNC interfaces. Nickel plated body for enhanced corrosion resistance Ideal to extend cable runs with male BNC connectors Designed to connect two Male BNC's together