The 42-830A-6-6-6-6 from Narda-ATM is a Waveguide Tee with Frequency 20 to 23 GHz, Isolation 16 to 30 dB, Isolation(Co-linear arms) 16 dB, Isolation(E & H arms) 30 dB, Balanced (dB) ± 0.25 dB. Tags: Magic Tee. More details for 42-830A-6-6-6-6 can be seen below.