A high-performance dry vacuum pump that is 100% oil-free. It employs a non-lubricated piston and cylinder. No maintenance is necessary for the bearings (they are all sealed and permanently lubricated). Built for continuous duty operation, and designed with a quiet, durable diaphragm but with piston performance. *Warning: Please note that this unit is not recommended for pumping acid, base, or organic vapors or gases. Be sure to properly identify intake and discharge before using this pump. Do not pump flammable or explosive gases or vapors or operate this pump in an atmosphere containing flammable or explosive gases or vapors. Bursting Hazard: Use on exhaust port the silencer or air handling parts suitable for pressures not less than 100 PSIG. Be sure to carefully follow instructions included in the package.