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Welch™ Standard-Duty Vacuum Pumps

Compact, economical WOB-L™ pumps for aqueous applications

Manufacturer: welch™  2581B-50

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Catalog No. 01-257-113

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Description & Specifications


Horsepower 0.33hp
Voltage 115V
Hertz 60Hz
Height (English) 12 in.
Height (Metric) 30.5cm
Width (English) 7.5 in.
Length (English) 17 in.
Length (Metric) 43.1cm
Shipping Weight (English) 32 lb.
Shipping Weight (Metric) 14.5kg
Includes Liquid trap on inlet, vacuum gauge and adjustment knob, exhaust muffler, suction cup feet and handles for convenient transportation
Certifications/Compliance CE
Flow Rate 100L/min.
Electrical Requirements 115V 60Hz
For Tube Size (English) 0.25 in.
For Tube Size (Metric) 0.7cm
Model 2581
Weight (English) 24.5 lb.
Weight (Metric) 11.1kg
Width (English) Exterior 8 in.
Height (English) Exterior 12 in.
Length (English) Exterior 17 in.

  • Ideal for filtration, vacuum ovens, aspiration and chamber roughing
  • Protect against accidental ingestion
  • Wetted parts resist corrosion from moisture