Swagelok is a privately held international company, focusing on the manufacture and sale of gas and fluid systems components, such as tube fittings, valves, tubing, and gauges. It was founded in 1947 by Fred A. Lennon in Cleveland, Ohio and in 1965, it moved to Solon, Ohio, where its headquarters remain. They are best known for creating the Swagelok compression tube fitting U.S. Patent 3,075,793 in 1959, a commonly used family of connectors for high and low pressure stainless steel tubing.