The M-251-52-92WS from Narda-MITEQ is a 90 Degree Hybrid Coupler with Frequency 250 to 500 MHz, Average Power 250 W, Insertion Loss 0.25 dB, Isolation 20 dB, Amplitude Balance ± 0.75 dB. Tags: Module with Connectors. More details for M-251-52-92WS can be seen below.