The Swagelok DV-2 Distillation Valve is a ball and needle 3/8 dual pump valve kit. A high vacuum, 2 piece valve setup, rated for up to 8/9 scale. This item is a major tool in controlling vacuum or bleeding atmosphere into your pump without risking any leak. All parts stainless steel including the five 3/8 barbs that attach to your vacuum hosing. Swagelok is leading the industry in these types of valves. See for yourself: swagelok/valves