The CBFU4U51050B from Cernex Inc is a Band Pass Filter with Frequency 480 to 560 MHz, Bandwidth 80 MHz, Insertion Loss 1.0 dB, Upper Rejection 65 dB at 680MHz, Lower Rejection 50 dB at 380MHz. Tags: Tubular Filter. More details for CBFU4U51050B can be seen below.