A gas path flow blocker comprising a plurality of vanes (21) each comprising a forward portion (25) and an aft portion (23) defining a plurality of gas paths, a forward ring (15) comprising a central axis (19) about which is circumferentially disposed the plurality of forward portions (25), and an aft ring (17) disposed about the central axis (19) about which is circumferentially disposed the plurality of aft portions (23) wherein the forward ring (15) and the aft ring (17) are moveable with respect to each other to at least partially block the flow of a gas through the gas paths.
