The 2747 from KR Electronics (A Division of NIC) is a Low Pass RF Filter with Frequency DC to 178 MHz, Stopband Frequency 204 MHz, 3 dB Cutoff Frequency 178 MHz, Lower Rejection 20 dB@204 MHz, Upper Rejection 1 dB@204 MHz. Tags: Plug In. More details for 2747 can be seen below.