Mueller Industries W 01903 Copper Coupling 1/2 in

Product Description

The MUELLER INDUSTRIES W 01903 is a wrot copper pipe coupling designed for 1/2 inch sweat connections in pressure piping systems. It features a C x C (copper-to-copper) end configuration joined by solder, making it a standard fitting for copper water supply, hydronic heating, and refrigeration piping. The fitting is manufactured from wrot copper, which is wrought and drawn for consistent wall thickness and reliable joint integrity. With an outside diameter of 5/8 inch, this coupling meets the dimensional requirements of standard 1/2 inch copper tube. Licensed plumbers and HVAC technicians regularly use this fitting for repairs, extensions, and new rough-in work.

This coupling is suited for residential and light commercial plumbing and HVAC applications wherever 1/2 inch copper tubing is joined end-to-end. Typical uses include domestic hot and cold water distribution, baseboard hydronic loops, fan coil supply and return lines, and copper refrigerant piping where solder joints are code-permitted. It is installed using standard soldering (sweat) technique with appropriate flux and solder per local mechanical and plumbing codes.

Key Features

• Wrot copper construction provides consistent wall thickness and strong solder joint integrity
• C x C end connections accept standard 1/2 inch copper tube on both ends
• Solder joint style for reliable, pressure-rated connections
• Meets ASME B16.22 and multiple ASME dimensional and pressure piping standards
• NSF 61G listed for use in potable water systems
• Outside diameter of 5/8 inch conforms to standard 1/2 inch copper tube dimensions

Compatibility

Designed as an OEM-style replacement and standard fitting for use with 1/2 inch copper tube (Type K, L, or M) in solder-joint pressure piping systems per ASME B16.22.

Installation Notes

Installation should be performed by a licensed plumber or HVAC technician in accordance with local plumbing codes, the International Plumbing Code (IPC), and ASME standards. Shut off and depressurize the water or refrigerant system and allow all piping to cool fully before cutting or fitting. Clean tube ends and fitting sockets with emery cloth and apply appropriate flux before soldering. Do not apply flame directly to the fitting socket for extended periods, as overheating can damage the fitting or burn off flux before solder flows properly.