The AE4000SSL1020 from Anatech Electronics is a Low Pass RF Filter with Frequency DC to 4 GHz, 3 dB Cutoff Frequency 4 GHz, Insertion Loss 1 to 1.5 dB, Rejection 60 dB, Power 15 W. Tags: Module with Connector, Stripline. More details for AE4000SSL1020 can be seen below.