The 78M-78MIS5 from Taiwan Rapidtek Inc. is a In Series RF Adapter with Frequency DC to 18 GHz, Contact Resistance 2 to 3 mOhms, Insertion Loss 0.2 dB, Insulation Resistance 5000 Mohms, Voltage Rating 1000 V. More details for 78M-78MIS5 can be seen below.