The 2852 from KR Electronics (A Division of NIC) is a Low Pass RF Filter with Frequency DC to 0.25 MHz, Stopband Frequency 350 KHz, 3 dB Cutoff Frequency 0.25 MHz, Lower Rejection 50 dB@350 KHz, Upper Rejection 3 dB@350 KHz. Tags: Plug In. More details for 2852 can be seen below.