The Kingray band pass filters are ideal for the rejection of unwanted out of band signals, thus providing a cleaner set of RF signals for distribution. As part of the design, these filters have a rubber o-ring & a rubber seal. The FL612BP is designed to pass through channels VHF 6 to 12 (174~230 MHz), also known as Channel Block A, rejecting out of band TV signals up to 50dB.