The IS-036043-X9 from Spectrum Elektrotechnik GmbH is a RF & Microwave Isolator with Frequency 3.6 to 4.3 GHz, Average Power Forward 5 W, Average Power Reverse 1 W, Insertion Loss 0.5 dB, Isolation 18 dB. Tags: Drop-In Isolator. More details for IS-036043-X9 can be seen below.