The WLB8-2.5-5-60-40-1000 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 2.5 / 5 MHz, Stopband Frequency Chosen Fco x 1.22 to 40 MHz, 3 dB Cutoff Frequency Choice of 2.5 to 5 MHz, Insertion Loss 0.5 to 0.6 dB, Rejection 60 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLB8-2.5-5-60-40-1000 can be seen below.