The M-88-108-91KWC502-R from Narda-MITEQ is a 90 Degree Hybrid Coupler with Frequency 88 to 108 MHz, Average Power 1000 W, Insertion Loss 0.25 dB, Isolation 20 dB, Amplitude Balance ± 0.6 dB. Tags: Drop In. More details for M-88-108-91KWC502-R can be seen below.