The SD3125 from Fairview Microwave is a DC Block with Frequency DC to 4 GHz, Insertion Loss 0.75 dB, Breakdown Voltage 100 V, VSWR 1.25:1, 1.50:1, Operating Temperature -55 to 125 Degree C. Tags: Connectorized, Inner DC Block. More details for SD3125 can be seen below.