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

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