The WVR-387.5B-15M01 from Wevercomm is a Band Stop Filter with Stopband Frequency 380 to 395 MHz, Bandwidth 15 MHz, Insertion Loss 1.5 dB, Rejection 50 dB Min @ 380MHz to 395MHz, Power 25 W. Tags: Module with Connectors, Cavity Filter, Notch Filter. More details for WVR-387.5B-15M01 can be seen below.