Welch 2042 1.2 cfm DryFast Ultra 2-Head Diaphragm Chemical Duty Pump

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SKU: Welch2042 Categories: ,

Welch DryFastTM PTFE oil-free diaphragm vacuum pumps enable precise vacuum control for organic evaporations with exclusive Advanced Vapor Management (AVM). Oil-Free, portable, chemical resistant, 2-head diaphragm design simplifies maintenance, no more frequent and costly oil change. Constructed with solid PTFE heads, PTFE diaphragms, Kalrez valves and utilizing fluorinated plastics on all wetted surfaces, these economical DryFastTM vacuum pumps are perfect for tough lab applications.

AI is now the official dealer of Welch vacuum pumps. These pumps are made in USA with one year warranty from Welch.

Free three feet 3/8″ white premium food grade silicone vacuum tubing ($19.99 value) included.



  • Advanced Vapor Management (AVM) for precise setting of vacuum level
  • Vacuum to 2 torr (2.6 mbar, 266 Pa)
  • Strips DMF fast
  • Chemically resistant
  • No oil changes, no cold trap required for water/alcohol solutions
  • Virtually maintenance-free solution for laboratory environment
  • Smaller footprint than oil pump saves lab space
  • Designed to work with rotary evaporators


 Electrical requirements
 110 Volts 60Hz single phase 1/5 HP, 150 watts
 Application  Rotary evaporation/distillation (low volatility solvents < 160oC B.P., ~2 liter), centrifugal
 concentrators, vacuum ovens (mid-size), pumping harsh vapors & gases.
 Pumping rate
 1.2 cfm
 Ult. vacuum pressure
 2 torr / 2.7 mbar
 Maximum vacuum  29.85 in. Hg
 Intake (vacuum connection)
 3/8″ hose barb
 Exhaust  1/4″ hose barb
 Adjustable vac./gas ballast  Yes
 Pump dimensions (LxWxH)
 13.8 x 6.8 x 8.8″
 Shipping dimensions (LxWxH)
 21 x 14 x 15″
 Pump weight
 21.25 Lb
 Shipping weight
 25 Lb
 Certification  CSA
 Manual  Click here to download



Standard package

 Part description


Part image

 Welch 2042 1.2 cfm full chemical-resistant oil-free diaphragm pump
1 pc

 White premium food grade silicone vacuum hose
3 ft

Specification: Welch 2042 1.2 cfm DryFast Ultra 2-Head Diaphragm Chemical Duty Pump

Weight 25 lbs

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