The WLK6-75-185-40-6000-20 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 75 / 185 MHz, Stopband Frequency Chosen Fco x 1.26 to 6 GHz, 3 dB Cutoff Frequency Choice of 75 to 185 MHz, Insertion Loss 0.6 to 0.85 dB, Rejection 40 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLK6-75-185-40-6000-20 can be seen below.