The HR-20D from Microlab is a DC Block with Frequency 380 MHz to 2.7 GHz, Insertion Loss Less than 0.12 dB, Less than 0.08 dB, Breakdown Voltage 3 kV, Power Rating 500 W, Input Power (Avg) 500 W. Tags: Connectorized, Inner DC Block. More details for HR-20D can be seen below.