The Compressed Gas Association (CGA) uses CGA numbers to identify connections for specific gas service. All hex nuts used in medical gas applications are manufactured to CGA standards as defined in CGA E-1 “Standard Connections for Regulator Outlets, Torches and Fitted Hose for Welding and Cutting Equipment”. Many common fittings are referred to as A-Size, B-Size, C-Size and D-Size. This letter identification system, developed by the International Acetylene Association (IAA), predates the CGA numbering system and is still used today. CGA limits pressure ratings on E-1 connections to a standard maximum working pressure of 200 PSIG (1380 kPa) for safety.

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Bay Corporation was founded in 1979. Our business is located in the city of Westlake, a suburb of Cleveland, Ohio. The company grew out of a need in the medical gas industry for a reliable source of quality fittings and connections. A small, privately-held company, Bay Corporation is committed to serving our customers' needs as we strive to provide a great place to work for our employees. We are dedicated to operating our business in both a professional and ethical manner.
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Superior Products is a premier manufacturer of compressed gas fittings for the industrial, medical and specialty gas industries. Manufacturing products since the mid-1940's, Superior Products has supported these industries with reliable products, innovative technologies, technical expertise, lean manufacturing and world-class customer service support.   Our sales, engineering and operations team offers over 200 combined years of experience in the compressed gas industry.
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For more than 60 years, Western has been supplying products for the control, storage and transmission of high-pressure gases to the industrial, medical and specialty gas markets–and leading the field in the ways that matter most. Western is dedicated to be the best provider of compressed gas systems and components.
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