Minivac diaphragm type Air Compressors Vacuum Pumps are completely oil free and are motor mounted. They don't require lubrication and are practically maintenance free. Diaphragm type Air CompressorsVacuum Pumps are more preferable compared to the conventional reciprocating piston type air compressors and sliding vane type vacuum pumps due to their minimum maintenance requirements. They are suitable for producing completely oil-free compressed air and vacuum production without environmental contamination through oil mist.