Dixon Valve Coupling MSC1540409K Welding Hose Coupling

Product Description

The DIXON VALVE COUPLING MSC1540409K is a brass welding hose coupling designed for use on acetylene gas lines. It features a 9/16 inch left-hand thread in UNF standard, which is the industry-standard thread direction for fuel gas connections to prevent accidental interchange with oxygen fittings. The left-hand thread is a critical safety design element recognized across welding and cutting applications. This coupling is installed by certified welding technicians and plumbing professionals working with oxy-fuel cutting and welding systems. It accepts a 1/4 inch inner diameter hose and provides a secure threaded connection between the hose and regulator or torch fitting.

This coupling is used in residential, commercial, and industrial welding environments wherever acetylene hose assemblies require a reliable threaded end fitting. It is suited for oxy-acetylene cutting, welding, and brazing setups. The compact, lightweight brass construction makes it appropriate for both shop and field installations. Technicians replacing worn or damaged hose end fittings on acetylene supply lines will find this a direct-fit threaded coupling solution.

Key Features

• Left-hand UNF thread — standard for acetylene and fuel gas connections per industry safety practice
• 9/16 inch thread size for secure hose-to-regulator or hose-to-torch connection
• 1/4 inch inner diameter hose compatibility
• Brass construction for corrosion resistance and durability in gas service
• Threaded connection type for positive, leak-resistant assembly
• Compact and lightweight at 0.1 pounds

Compatibility

Designed as an OEM-style replacement threaded coupling for acetylene welding hose assemblies requiring a 9/16 inch left-hand UNF threaded end fitting with 1/4 inch inner diameter hose.

Installation Notes

Installation should be performed by a qualified welding technician or pipefitter familiar with fuel gas hose assembly practices. Shut off the acetylene supply at the cylinder valve and bleed the hose before removing any fittings. Left-hand threads tighten counterclockwise — do not force right-hand tools or techniques on this fitting. Verify all connections are leak-free with an approved leak-detection solution before returning the system to service.