The WRCT8-921-924-928-931-50 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 924 to 928 MHz, Bandwidth 4 MHz, Insertion Loss 0.6 to 1.5 dB, Rejection 50 dB, VSWR 1.43:1. Tags: Module with Connectors, Cavity Filter. More details for WRCT8-921-924-928-931-50 can be seen below.