The QDDC-2000-6000-K4-40-8S from Qualwave is a Dual Directional Coupler with Coupling 40 dB, Coupling Variation ±1 dB, Frequency 2000 to 6000 MHz, Average Power 400 W, Insertion Loss 0.3 dB. Tags: Module with Connectors. More details for QDDC-2000-6000-K4-40-8S can be seen below.