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The gas generator ball valve. Note that the valve consists of both the portion above the diagonal silver component (i.e., the part with the ID plate) as well as the portion just below and to the left of the diagonal silver component (i.e., the bolted silver flange).

The oxidizer line connects to the ball valve at the silver, bolted flange on the lower portion of valve and the fuel line connects at the flange on the ball valve's upper left.