E99-320C13 - Miller CGA 320 CO2 Tailpiece with Filter and Washer

Technical Overview of the Miller E99-320C13 Tailpiece

The Miller E99-320C13 is a specialized gas connection component designed for use with Carbon Dioxide (CO2) delivery systems in industrial and welding environments. This tailpiece, also commonly referred to as a nipple or stem, is engineered to meet the Compressed Gas Association (CGA) standard 320. The CGA 320 connection is the industry-standard fitting for CO2 cylinders, utilizing a flat-faced sealing surface that requires a washer to ensure a gas-tight seal. This specific SKU is manufactured by Miller Electric, ensuring strict adherence to dimensional tolerances and material quality standards required for high-pressure gas equipment.

Constructed from high-quality brass, this tailpiece features a plated finish. The plating serves a dual purpose: it enhances the aesthetic uniformity of the equipment and, more importantly, provides a layer of protection against environmental corrosion and oxidation. In industrial settings where humidity and chemical exposure vary, plated fittings often maintain their integrity and thread quality longer than bare brass alternatives. The tailpiece is designed to mate with a standard CGA 320 nut (sold separately) to secure the regulator or manifold to the cylinder valve.

A critical feature of the E99-320C13 is the inclusion of an integrated filter and a sealing washer. The filter is positioned within the inlet of the tailpiece to trap particulate matter, such as rust, scale, or dust, that may be present inside the gas cylinder. By preventing these contaminants from entering the regulator, the filter protects the sensitive internal diaphragm and valve seat from damage, thereby extending the service life of the regulator and maintaining consistent flow characteristics. The included washer is essential for the CGA 320 connection type, as it provides the necessary compression seal between the flat face of the tailpiece and the cylinder valve outlet.

Maintenance and safety personnel should verify that the filter is clean and intact during routine inspections. Replacing worn or damaged tailpieces is a standard procedure in gas apparatus maintenance to prevent leaks and ensure safe operation. This Miller OEM part guarantees compatibility with Miller regulators and other standard gas equipment requiring a CGA 320 inlet connection.