Linear gradient makers with side outlets control gradient flow by a Teflon* valve centered between the two chambers. Outflow channel is fitted with a male luer adapter which can be used with any needle or luer valve. Smaller gradient makers (10, 20 or 50 ml per side) have support rod for attachment to a ring stand.
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Colonial Scientific has teamed up with the industry leaders, Fisher Scientific and VWR, and now offers their entire product line. Colonial Scientific provides any part from the Fisher Scientific site with a part number.