The M-12-52-91KWN-R from Narda-MITEQ is a 90 Degree Hybrid Coupler with Frequency 100 to 500 MHz, Average Power 1000 W, Insertion Loss 0.6 dB, Isolation 16 dB, Amplitude Balance ± 0.8 dB. Tags: Module with Connectors. More details for M-12-52-91KWN-R can be seen below.