The 4572B from Narda-MITEQ is a Mechanical Phase Shifter with Frequency 3 to 18 GHz, Phase Shift 2 Degree @ 3 GHz, 20 Degree @ 18 GHz, Power W 30 W, Power 44.77 dBm, Insertion Loss 0.4 dB. Tags: Module with Connector. More details for 4572B can be seen below.