The LCAD30002 from L-COM is a In Series RF Adapter with Frequency DC to 4 GHz, Contact Resistance 1.5 Mohms (Inner Conductor DC Resistance), 1 mOhms (Outer Conductor DC Resistance), Insulation Resistance 5000 MOhms, Temperature -65 to 165 Degree C, Voltage Rating 500 Vrms. More details for LCAD30002 can be seen below.