The T1BQ3 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 1.8 to 1.9 GHz, Average Power 50 W, Average Power Forward 50 W, Insertion Loss 0.4 dB, Isolation 20 dB. Tags: Drop-In, Drop-In Isolator. More details for T1BQ3 can be seen below.