Series N811 diaphragm pumps are single-head, dry-running devices used in a wide range of laboratory applications. They transfer, evacuate and pump down without contamination. The heart of these very compact pumps is a KNF structured diaphragm. This patented diaphragm was stress-optimized using the finite elements method. As a result, we were able to make the pumps smaller while increasing the service life of the diaphragm. The pumps are available in various versions differing in the materials which contact the media. Technical features: 100% oil-free transfer. Pure transfer, vacuum service only. Version for slightly aggressive or corrosive gases and vapors. Maintenance-free. Environmentally friendly. High level of gas tightness.