The CLPFL-0300 from Crystek Corporation is a Low Pass RF Filter with Frequency DC to 300 MHz, Insertion Loss 0.10 to 1.16 dB, Rejection 2.12 to 57.97 dB, Power 4 W, Return Loss 12.88 to 41.23 dB. Tags: Connectorized, Butterworth Filter. More details for CLPFL-0300 can be seen below.