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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™  2044B01

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Catalog No. 01-257-508

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Description & Specifications


Air Displacement 35L/min.
Max. Pressure 9 torr
Includes Pump, 6 ft powercord and plug (115V US standard)
For Use With (Application) Rotary Evap. BP to 100°C , > 2L
Model 2044
Height (English) 8.8 in.
Height (Metric) 22.3cm
Length (English) 13.8 in.
Length (Metric) 35.2cm
Certifications/Compliance CE, CSA
Horsepower 0.2hp
Voltage 115V
Hertz 60Hz
Pump Head Material PTFE
Electrical Requirements 115V 60Hz
Flow Rate 35L/min.
For Tube Size (English) 0.25 in.
For Tube Size (Metric) 0.63cm
Material PTFE, Perfluoroelastomer
Weight (English) 21.25 lb.
Weight (Metric) 9.6kg
Width (English) 6.8 in.
Shipping Weight (English) 25 lb.
Shipping Weight (Metric) 11.3kg

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