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Welch™ DryFast™ and DryFast Ultra™ Chemical Duty Vacuum Pumps

Designed for use with rotary evaporators, concentrators and vacuum ovens

Manufacturer: welch™  2042B01

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Catalog No. 01-257-506

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Description & Specifications


Max. Pressure 2 torr
Air Displacement 35L/min.
Includes Pump, 6 ft powercord and plug (115V US standard)
For Use With (Application) Rotary Evap. BP to 160°C , > 2L
Model 2042
Weight (English) 21.25 lb.
For Tube Size (English) 0.25 in.
Material PTFE, Perfluoroelastomer
Width (English) 6.8 in.
Shipping Weight (English) 25 lb.
Horsepower 0.2hp
Voltage 115V
Length (English) 13.8 in.
For Tube Size (Metric) 0.63cm
Weight (Metric) 9.6kg
Electrical Requirements 115V 60Hz
Certifications/Compliance CE, CSA
Pump Head Material PTFE
Hertz 60Hz
Height (Metric) 22.3cm
Shipping Weight (Metric) 11.3kg
Height (English) 8.8 in.
Length (Metric) 35.2cm

Use these oil-free DryFast vacuum pumps for applications requiring chemical resistance. DryFast pumps provide mid-range vacuum (2 to 79 torr) with easy adjustment and low maintenance. Flow rates from 25 to 70 L/min). Select a DryFast model to suit your application needs:


  • Rotary Evaporation to 40°C atmospheric B.P.: 2014B-01 (1-head design)
  • Rotary Evaporation to 100°C atmospheric B.P.: 2034B-01, 2044B-01
  • Rotary Evaporation to 40°C atmospheric B.P.: 2032B-01, 2042B-01
  • Vacuum Filtration to 2 funnels: 2014B-01 (1-head design)
  • Vacuum Filtration to 6 funnels: 2037B-01, 2047B-01
  • Vacuum Ovens to 1.5 ft³: 2042B-01
  • Vacuum Ovens to 4.5 ft³: 2047B-01

Design Advantages
  • PTFE / fluorinated contact surfaces
  • Efficient 2-head diaphragm design reduces maintenance
  • Advanced Vapor Management knob for easy vacuum adjustment
  • Compact, portable, quiet
  • Readily connects using ¼ in. ID tubing
  • All listed models 115V 60 Hz