The FN-3700W from Filtronetics is a Low Pass RF Filter with Frequency DC to 175 MHz, Stopband Frequency 187 to 375 MHz, 3 dB Cutoff Frequency 175 MHz, Insertion Loss 0.5 dB, Rejection 15 to 55 dBc. Tags: Module with Connector. More details for FN-3700W can be seen below.