The CLPFL-1000 from Crystek Corporation is a Low Pass RF Filter with Frequency DC to 1000 MHz, Insertion Loss 0.05 to 1.38 dB, Rejection 3.15 to 51.18 dB, Power 4 W, Return Loss 8.99 to 35.42 dB. Tags: Connectorized, Butterworth Filter. More details for CLPFL-1000 can be seen below.