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Eliminate the loss of expensive reagents and media messes during poured transfers with the air purging system bottle-top dispensers. Through a direct displacement piston system, identical amounts are reproduced for testing control. Being highly resistant, the standard bottle-top dispensers allow a safer chemical transport. The right angled spout of bottle-top dispensers requires no cap to keep clean workspaces. Choose between preset or adjustable knob volume tops to modify and lock the precise substance amount desired.