A pneumatically operated stores ejector rack for an aircraft having an adjustable flow restricting device for variably apportioning the flow of pressurized gas from a manifold to the store ejection thrusters. The flow restricting device includes at least one adjustable valve assembly, having a valve and a valve body, for varying the pressure of gas supplied to the thruster. It also includes a feed conduit connecting the manifold and the valve, and a collar threadably engageable with the manifold and the feed conduit for urging the valve into contact valve body. Also disclosed is a method for apportioning the flow of pressurized gas between a pair of thrusters in a stores ejection rack which includes the flow restricting device.