HPI Cylinders is a family-owned hydraulic and pneumatic cylinder manufacturer established in 1946. They offer a complete line of interchangeable NFPA cylinders, custom-designed cylinders, and welded construction cylinders with a 3-year warranty. HPI Cylinders excels in custom designing new cylinders, improving existing cylinders, and reverse engineering cylinders from samples. They also provide repair services, including rebuilding cylinders to 'like new condition' with a 1-year warranty. With 77 years of experience, HPI Cylinders focuses on manufacturing, repairs, sales, and customer service in the USA.