Please Note: The Stokes 310 vacuum booster pump was discountined in 2005. No direct replacement was ever produced by Edwards Stokes Vacuum. The following vacuum pump is a direct drop-inreplacement, with the exact same specifications.
Direct drive, rotary lobe / impeller, hydrocarbon fluid, CFM 400:
Ultimate pressure 1 millitorr
Inlet / Exhaust connection 4" ASA
Integral Bypass Valve Eliminates Need for Pressure Switch