The robust vacuum pump CRVpro 4 belongs to the new two-stage rotary vane pump generation from Welch. These sturdy vacuum pumps offer a long service life, reliability and low maintenance. The CRVpro 4 is the perfect partner for freeze dryer, Schlenk lines and industrial applications. Advantages: • lower oil consumption due to low heat generation during operation • corrosion protection by coating the inner surface of the oil housing • large oil reservoir for extended oil change intervals • suction nozzle valve • voltage-changeable motor Scope of delivery: pump, 3 power cords (EU / UK / US), 2 bottles of vacuum oil, centering ring with dirt trap , Centering ring, 2 clamping rings (DN16KF).