Pressure Technologies Plc designs and manufactures seamless steel gas cylinders. The company markets its products under the Chesterfield brand. The company conducts its business through Chesterfield Special Cylinders Ltd., which designs, manufactures and offers retesting and refurbishment services for a range of specialty high pressure, seamless steel gas cylinders for global energy and defense markets. It operates through three divisions: Cylinders, Engineered Products and Alternative Energy. Pressure Technologies was founded in 1897 and is headquartered in Sheffield, the United Kingdom.