The 2304-F from KR Electronics Inc is a Low Pass RF Filter with Frequency DC to 5.75 MHz, Stopband Frequency 20.25 MHz, 3 dB Cutoff Frequency 5.75 MHz, Lower Rejection 45 dB@20.25 MHz, Upper Rejection 0.1 dB@20.25 MHz. Tags: Plug In. More details for 2304-F can be seen below.