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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Precision Medical, Inc. is a global leader in the manufacturing and sale of respiratory devices and medical fittings, helping hospital facilities and homecare providers in more than 50 countries around the world achieve positive patient outcomes. Its innovative and lightweight product lines include oxygen regulators, aspirators, air compressors, flowmeters, oxygen concentrators, medical blenders and vacuum regulators. The company was founded in 1984 and is based in Northampton, Pennsylvania.
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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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