The AE20B9437 from Anatech Electronics is a Band Pass Filter with Frequency 17.5 to 22.5 MHz, Bandwidth 5 MHz, Center Frequency 20 MHz, Insertion Loss 1 dB, Upper Rejection 40 dB @ 29-300 MHz. Tags: Surface Mount, Lumped Component Filter. More details for AE20B9437 can be seen below.