Funnel provides precise control of liquid delivery

The Rotaflo® stopcock seals tight with only a tenth of a turn, and a white line appears as the seal is set. Funnel will not leak or freeze and requires no lubricants, springs, or retainers. Only PTFE and borosilicate glass come in contact with the liquid. Supplied with one polyethylene and one glass stopper. Durable white enamel scale.