The FN-3335W from Filtronetics is a Low Pass RF Filter with Frequency DC to 250 MHz, Stopband Frequency 276 MHz to 1 GHz, 3 dB Cutoff Frequency 250 MHz, Insertion Loss 0.25 dB, Rejection 45 dB. Tags: Module with Connector. More details for FN-3335W can be seen below.