The BRF 4/1-125 from Amphenol Procom is a Band Stop Filter with Stopband Frequency 66 to 88 MHz, Insertion Loss 0.5 to 1 dB, Power 175 to 300 W, VSWR 1.50:1, Operating_Temperature -30 to 60 Degree C. Tags: Module with Connectors, Cavity Filter. More details for BRF 4/1-125 can be seen below.