The CAK-DF-NF from Xiamen HDG Telecom Equipments is a Between Series RF Adapter with PIM -150 dBc, Contact Resistance 1 to 1.5 mOhms, Frequency DC to 3 GHz, Mating Cycles 500 Cycles, Insulation Resistance 5000 MOhms. More details for CAK-DF-NF can be seen below.