NOVELTY - The annular gas distributor comprises two compartments, which are gas-tightly connected with one another by a detachable securing unit, a gas inlet opening, and a gas outlet opening. The gas distributor is mounted on a reactor for deposition of polycrystalline silicon using the securing unit. The gas outlet opening of the gas distributor is communicatively coupled to a gas inlet opening of the reactor, and/or the gas inlet opening of the gas distributor is communicatively coupled to a gas supply media of the reactor via a gas supply line (31).    USE - The annular gas distributor is useful: in a reactor for deposition of polycrystalline silicon (claimed), which is useful as a raw material for the production of single crystal silicon for semiconductors of solar cells; and as an exhaust manifold.    ADVANTAGE - The annular gas distributor allows uniform transportation of gas to the reactor at high pressure, thus ensuring rapid deposition of silicon without contamination and cracks, and is easy and rapid to clean.    DETAILED DESCRIPTION - The annular gas distributor comprises two compartments, which are gas-tightly connected with one another by a detachable securing unit, a gas inlet opening, and a gas outlet opening. The gas distributor is mounted on a reactor for deposition of polycrystalline silicon using the securing unit. The gas outlet opening of the gas distributor is communicatively coupled to a gas inlet opening of the reactor, and/or the gas inlet opening of the gas distributor is communicatively coupled to a gas supply media of the reactor via a gas supply line (31). The distributor is capable of introducing gas into the reactor. The gas outlet opening is useful as reactor nozzles for supply of gas. The distributor further comprises detachable flange connections (6) as a fastening unit. The nozzles have supply lines having the shape as that of the gas distributor.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a reactor.    Reactor head (1)    Bottom plate (5)    Flange connections (6)    Support body (7)    Gas supply line. (31)