The AE40L8846 from Anatech Electronics is a low pass filter that operates up to 40 MHz. It has an insertion loss of less than 0.3 dB, a return loss of more than 15 dB and rejection of more than 40 dB at frequencies above 50 MHz. The filter can handle up to 25 Watts of power and is available in a module with SMB connectors. It measures 2.51 x 0.75 x 0.50 inches.