About Knox Western
Founded in the early 1930s, Knox Western began its journey in compressor repair and modernization. Over the decades, it evolved into a leading distributor for major global manufacturers before taking a defining step forward in 1973, becoming an OEM with the development of its proprietary TP Series compressors.Building on decades of hands-on engineering expertise, Knox Western further expanded its capabilities in 2000 with the design and construction of its first CNG refueling station, marking a significant milestone in its contribution to clean and efficient mobility solutions.
Today, Knox Western designs and manufactures all its equipment at its headquarters in Erie, Pennsylvania, delivering high-quality, high-reliability compressor systems to customers in over 70 countries worldwide. Backed by advanced technology, an experienced engineering team, and a strong global network of representatives, Knox Western is trusted for both standard and custom-engineered solutions with a proven reputation in demanding industrial environments.


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92 Years as a Compressor Solutions Provider
1930
Repairs & Upgrades to All OEMs
Earl E Knox Company founded
to fill demand for quality compressor rebuilds in the US
1960
Major OEM Distributor
Becomes Top OEM Distributor for major US OEMs including Chicago Pneumatic, Joy, and Quincy.
1973
Major OEM Distributor
Knox Western Group formed as a gas compressor OEM with the internal development of the "TP" Splash-Lube Compressor line.
1992
OEM
OEM Product Line expanded to include Pressure-Lube "Eagle" Series gas compressors.
1999
OEM
Introduction of "Lube-Free" Compression Technology.
2019
OEM
Designed the first complete Hydrogen package for a refueling station in California.
2024
Acquisition
Knox Western was acquired by the Didwania Group in 2024.
1930
Repairs & Upgrades to All OEMs
Earl E Knox Company founded
to fill demand for quality compressor rebuilds in the US
1960
Major OEM Distributor
Becomes Top OEM Distributor for major US OEMs including Chicago Pneumatic, Joy, and Quincy.
1973
Major OEM Distributor
Knox Western Group formed as a gas compressor OEM with the internal development of the "TP" Splash-Lube Compressor line.
1992
OEM
OEM Product Line expanded to include Pressure-Lube "Eagle" Series gas compressors.
1999
OEM
Introduction of "Lube-Free" Compression Technology.
2019
OEM
Designed the first complete Hydrogen package for a refueling station in California.
2024
Acquisition
Knox Western was acquired by the Didwania Group in 2024.
3500+ Global Compressor Installations
DIDWANIA GROUP




Global Operations


Diaphragm Compressors

Boosters
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LNG-Centrifugal Pumps











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