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Contamination-free transfer, evacuation and compression. Models N-86 and N-022 with 2.5 and 4 bar relative pressure can also be used as compressors. Can be operated dry. No lubrication required. Maintenance free. Silent. The 2-head models are constructed with two-stage linear diaphragms. All models (except model N-022), are constructed with a patented stress-optimised structured diaphragm system, which allows for small pump size and long diaphragm life. Approximate leakage rate: 6 x 10-3 mbar x L/s. Fitted with thermal switch and fuse.