The JIWR75-12D7-12K75T13K5 from JQL Electronics is a Waveguide Isolator with Frequency 12.75 to 13.5 GHz, Insertion Loss 0.3 dB, Power 10 W(Fwd), 2 W(Reverse), Power fwd 10 W, Isolation 25 dB. More details for JIWR75-12D7-12K75T13K5 can be seen below.