WOB-L® Piston Pumps and Compressors

Piston Compressors and Vacuum Pumps Designed With Thomas WOB-L® Technology to Provide Exceptional Pressure and Flow.

Thomas piston pumps utilize proprietary WOB-L® pump technology from Gardner Denver. WOB-L® piston pumps can provide higher pressure and flow capabilities than many other pump technologies, in a much smaller package. They cover a wide range of applications due to the breadth of product platforms and performance capability.

Select Your Required Open Flow Range

Up to 28.3 lpm / Up to 1 cfm

28.3—56.6 lpm / 1—2 cfm

56.6—84.9 lpm / 2—3 cfm

85.0—113.3 lpm / 3—4 cfm

113.3—141.6 lpm / 4—5 cfm

141.6—212.4 lpm/ 5—7.5 cfm

Benefits of Thomas Piston Vacuum Pumps and Compressors

Thomas oil-less piston vacuum pump and compressors are built with corrosion-resistant materials, making them suitable for industrial and mobile applications. 

The WOB-L® piston pump designed by Thomas provides a free flow rate from 0.19 cfm (5.4 l/min) to 7.5 cfm (212.4 l/min) and offers maximum continuous vacuum capability up to 990 mbar (29.2 in.Hg), and maximum continuous pressure capability up to 12 bar (175 psi).

Choose Thomas Piston Vacuum Pumps and Compressors for a Wide Range of Gas Applications

Thomas WOB-L® piston compressors and vacuum pumps are the best choice for medical, food, or environmental applications that require long life and high performance. High-pressure piston pumps and compressors are often selected by the medical market for their high quality and reliability. Life-saving equipment such as oxygen concentrators, ventilators, and other breathing support devices rely on our piston pumps for their critical functions.

With three manufacturing sites, located in the USA, Germany, and China, including on-site regulatory testing, injection molding, and 3D printing capabilities, we offer gas flow solutions for a variety of industries. Application expertise enables Thomas’ engineers to tailor pump performance even to the most complex and challenging application.

Piston Pumps that Suite OEM Devices in Key Industries

healthcare industry

Medical Devices

environmental industry


lab life science industry

Life Sciences

automotive industry


food and beverage industry

Food & Beverage

general manufacturing applications

General Manufacturing

WOB-L® Gas Piston Pump Operating Principle

The WOB-L® piston pumps are a type of reciprocating pump that converts the rotary motor’s energy into the piston's linear motion within the pump cylinder. The piston rod, usually single-casted, is mounted to an eccentric bearing assembly attached to the motor shaft.

A rod/eccentric assembly that rotates about the shaft causes the piston end to tip or wobble, providing the origins for the trademark name. To compensate for the 'wobbling' and increase the pump's efficiency, the piston is sealed to the cylinder by a flanged disk cup, which forms both axial and radial seal and a mechanical guide for the piston. This positive displacement pump runs dry. The cylinder is coated with low friction and high heat conductivity materials and requires no lubrication.

Learn about WOB-L® Piston Technology

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