The 2289_45 from KR Electronics (A Division of NIC) is a Low Pass RF Filter with Frequency DC to 45 MHz, Stopband Frequency 52 MHz, 3 dB Cutoff Frequency 45 MHz, Lower Rejection 45 dB@52 MHz, Upper Rejection 4 dB@52 MHz. Tags: Plug In. More details for 2289_45 can be seen below.