The LCAD30009 from L-COM is a Between Series RF Adapter with Contact Resistance 6 mOhms(Inner Conductor DC Resistance)), 1 mOhms(Outer Conductor DC Resistance), Frequency DC to 4 GHz, Insulation Resistance 5000 MOhms, Temperature -55 to 125 Degree C, Voltage Rating 375 Vrms. More details for LCAD30009 can be seen below.