The FN-595W from Filtronetics is a Low Pass RF Filter with Frequency DC to 5.25 MHz, Stopband Frequency 6.2 MHz, 3 dB Cutoff Frequency 5.25 MHz, Insertion Loss 1 dB, Rejection 30 dB. Tags: Drop-In, Module with Connector. More details for FN-595W can be seen below.