The WRCD20-1420-1422-1437-1439-40 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 1.422 to 1.437 GHz, Bandwidth 15 MHz, Insertion Loss 2.25 to 3.5 dB, Rejection 40 dB, VSWR 1.50:1. Tags: Module with Connectors, Cavity Filter. More details for WRCD20-1420-1422-1437-1439-40 can be seen below.