The DB-B1B25A-2KV3G/H44-H4 from Rosnol is a DC Block with Frequency DC to 3 GHz, Insertion Loss 0.2 dB, Breakdown Voltage 2000 V, VSWR 1.20:1, Return Loss 20.8 dB. Tags: Connectorized, Inner DC Block. More details for DB-B1B25A-2KV3G/H44-H4 can be seen below.