A breast box nozzle for a paper making machine or the like is shown as having an adjustably positionable shutter member which can be moved generally further and lesser into the path of flow of a stream of pulp stock as to thereby determine the thickness of the discharge stream of pulp stock; a support arrangement applies a pressure to the shutter member as against a downstream side thereof in order to counter the forces generated by the stream of pulp stock upstream of the shutter member and applied as against the upstream side thereof tending to undesirably deform the shutter member; the support arrangement has an elastomeric member, which can be internally pressurized, generally interposed between a relatively fixed support member and a downstream side of the shutter member; and an elongated slide member is generally interposed between the elastomeric member and the downstream side of the shutter member.
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