The FN-3505-2W from Filtronetics is a Low Pass RF Filter with Frequency DC to 2 GHz, Stopband Frequency 5 GHz, 3 dB Cutoff Frequency 2 GHz, Rejection 60 dB, Upper Rejection 60 dB@5 GHz. Tags: Module with Connector, Lumped Component Filter. More details for FN-3505-2W can be seen below.