The D33-A1 from ANOISON Electronics LLC is a DC Block with Frequency DC to 8 GHz, Insertion Loss 0.3 to 1 dB, Breakdown Voltage 50 V, VSWR 1.25:1, 1.55:1, Operating Temperature -55 to 125 Degree C. Tags: Inner DC Block. More details for D33-A1 can be seen below.