The E504-4 from Microwave Engineering Corporation is a 90 Degree Hybrid Coupler with Frequency 2 to 4 GHz, Average Power 200 to 800 W, Peak Power 6 kW, Isolation 23 dB, Coupling 3.3 dB. Tags: Module with Connectors, Octave Band. More details for E504-4 can be seen below.