Conveniently fills multiple CRY-AC^® units at a time. Device affixes to top of dewar (i.e., is not removed after each use), has a simple on/off switch, and works like a faucet. Includes a filter that helps clean the LN₂ before it is withdrawn. Recommended for dewars of 20 litters and over. When ordering, please specify dewar manufacturer, model # and capacity.