Chesterfield Special Cylinders Holdings (formerly Pressure Technologies) is a designer and manufacturer of high-pressure systems serving the global energy, defense, and industrial gases market. It operates through two business units: Cylinders and Precision Machined Components. The former unit is involved in the provision of high-pressure gas containment solutions and services, while the latter manufactures specialized precision engineered valve wear parts used in the oil and gas industries. The Precision Machined Components unit comprises the four brands of Roota Engineering, Quadscot Precision Engineering, Al-Met, and Martract.