These condensates reduce pump efficiency and extend processing time. KNF's model N860.3FT.40P with self-drying Power Dry feature uses an electronically-controlled valve that periodically meters ambient air into the pump. The sudden flow of air forces liquids out of the pump heads, immediately restoring efficiency and reducing processing time. Chamber vacuum levels are unaffected. In addition, KNF's solid PTFE heads and diaphragms provide the maximum corrosion resistance available And, because there is no pump oil to replace and dispose of, they are virtually maintenance-free.