The FN-4570W from Filtronetics is a Low Pass RF Filter with Frequency DC to 350 MHz, Bandwidth 350 MHz, Stopband Frequency 400 MHz to 3 GHz, 3 dB Cutoff Frequency 350 MHz, Rejection 55 dB. Tags: Drop-In, Module with Connector, Lumped Component Filter. More details for FN-4570W can be seen below.