An isolation valve comprising: a housing having an internal surface within the housing, the internal surface having a first outlet and second outlet; an air gate having an outward face opposite the internal surface, the air gate located within the housing and configured to move to at least one of a first position blocking flow to the first outlet, a neutral position blocking flow to neither the first outlet nor second outlet, and a second position blocking flow to the second outlet; a seal groove located on the outward face of the air gate; a seal located within seal groove, the seal configured to form a sealed connection with the internal surface around at least one of the first outlet when in the first position and the second outlet when in the second position; and a retainer configured to secure the seal within the seal groove using a fastening mechanism.