The QLF-4000-60 from Qualwave is a Low Pass RF Filter with Frequency DC to 4 GHz, Stopband Frequency 4.5 to 12.3 GHz, Insertion Loss 1 to 1.5 dB, Upper Rejection 60 dB @ 4.5 to 12.3 GHz, Power 15 W. Tags: Module with Connector. More details for QLF-4000-60 can be seen below.