Welch WOB-L Dry Piston Vacuum Pump – Model 2561B-50, 2.3 CFM, 5 Torr

The Welch 2561B-50 WOB-L Dry Piston Vacuum Pump is a high-performance, oil-free solution designed for standard-duty vacuum applications. With a compact footprint, built-in vacuum regulator, and high water vapor tolerance, it’s ideal for laboratory use where clean, dry vacuum is required.

Key Features:

• Oil-free operation – minimal maintenance and clean vacuum

• Compact and lightweight – perfect for benchtop use

• Built-in vacuum regulator, inlet liquid trap, and muffler included

• High water vapor tolerance – suitable for filtration and aspiration

• Voltage: 115V, 60Hz

• Free Air Displacement: 2.3 CFM (65 L/min)

• Ultimate Pressure: 5 Torr (6.7 mbar)

Note: Not recommended for use with strongly acidic, basic, or organic vapors.

Common Applications:

• Cell culture media aspiration and sterile filtration

• DNA/RNA/Plasmid extraction

• Vacuum ovens and drying

• Vacuum bag parts forming

• Turbidity testing and porosity testing

• Air/gas sampling, package integrity testing

• General lab and light industrial vacuum tasks

Specifications