The Nalgene 6132-0020 hand-operated vacuum pump has a 36cc per stroke transfer rate and generates 25 inches of mercury (Hg) vacuum in two strokes. A vacuum gauge displays the current vacuum level. It is made of polyvinyl chloride (PVC) for strength and corrosion resistance and includes a 2-foot length of 1/4" flexible tubing. The pump has an adjustable vacuum release rate and is suitable for liquid transfer and vacuum testing operations. The case contains four pumps and is repairable using repair kit 6132-2000 (sold separately).Thermo Fisher Scientific manufactures analytical instruments, laboratory equipment, consumables, and software under the Thermo Scientific, Fisher Scientific, Barnstead, Nalgene, and Orion brands, among others. The company is headquartered in Waltham, MA.