The AE25S2040 from Anatech Electronics is a Band Stop Filter with Stopband Frequency 23 to 28.5 MHz, Bandwidth 5.5 MHz, Insertion Loss 1 to 3 dB, Rejection 50 dB, Return Loss 15 dB. Tags: Module with Connectors, Notch Filter. More details for AE25S2040 can be seen below.