The ZXLF-K122+ from Mini Circuits is a Low Pass RF Filter with Frequency DC to 1.15 GHz, Stopband Frequency 2.19 to 21 GHz, 3 dB Cutoff Frequency 1.51 GHz, Insertion Loss 1.7 to 2.5 dB, Rejection 10 to 21 dB. Tags: Module with Connector, Reflectionless Filter. More details for ZXLF-K122+ can be seen below.