The 2170-S from KR Electronics (A Division of NIC) is a Low Pass RF Filter with Frequency DC to 5 MHz, Stopband Frequency 7.25 MHz, 3 dB Cutoff Frequency 5 MHz, Lower Rejection 45 [email protected] MHz, Upper Rejection 0.2 [email protected] MHz. Tags: Plug In. More details for 2170-S can be seen below.