The FN-4701W from Filtronetics is a Band Pass Filter with Frequency 161.9625 to 161.9875 MHz, Bandwidth ±12.5 KHz, Center Frequency 161.975 MHz, Insertion Loss 5 dB, Rejection 40 dB. Tags: Module with Connectors, Drop-In, Surface Mount, Crystal Filter. More details for FN-4701W can be seen below.