The LCAD30003 from L-COM is a Between Series RF Adapter with Contact Resistance 3 mOhms(Inner Conductor DC Resistance)), 2 mOhms(Outer Conductor DC Resistance), Frequency DC to 6 GHz, Insulation Resistance 5000 MOhms, Temperature -40 to 90 Degree C, Voltage Rating 100 Vrms. More details for LCAD30003 can be seen below.