The chemically-resistant series N842.3 diaphragm pump is a double-head, oil-free device used in a wide range of laboratory applications. They transfer and pump down without contamination. The heart of this very compact pump 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 pump smaller while increasing the service life of the diaphragm. Technical features: 100% oil-free transfer. Pure transfer, evacuation and compression. Highly compatible with vapors and condensation. Chemically-resistant. Therefore suitable for highly aggressive or corrosive gases and vapors. Maintenance-free. Environmentally friendly. Gastight, leakage rate approx. 6 x 10-3 mbar x l/s, not tested in serial production.