The FNP-1287 from Filtronetics is a Low Pass RF Filter with Frequency DC to 50 MHz, Bandwidth 50 MHz, Stopband Frequency 132 to 600 MHz, 3 dB Cutoff Frequency 50 MHz, Insertion Loss 0.5 to 0.7 dB. Tags: Module with Connector, Lumped Component Filter. More details for FNP-1287 can be seen below.