The LCAD30014 from L-COM is a Between Series RF Adapter with Contact Resistance 1.5 mOhms(Inner Conductor DC Resistance)), 1 mOhms(Outer Conductor DC Resistance), Frequency DC to 3 GHz, Insulation Resistance 5000 MOhms, Temperature -65 to 165 Degree C, Voltage Rating 500 Vrms. More details for LCAD30014 can be seen below.