Dixon Valve Coupling MSC1540509K Welding Hose Coupling

Product Description

The DIXON VALVE COUPLING MSC1540509K is a brass welding hose coupling designed for acetylene gas lines. It features a 9/16-inch left-hand thread in UNF standard, which is the industry convention for fuel gas connections and serves as a built-in safeguard against misconnection with oxygen-side fittings. The 5/16-inch inner diameter accommodates standard acetylene hose sizes. This fitting is installed by welding technicians, pipefitters, and gas equipment service professionals working on oxy-fuel cutting and welding setups in fabrication shops, maintenance facilities, and field service environments.

This coupling is suited for acetylene hose assemblies in both light-duty and production welding applications. It connects the acetylene regulator outlet or torch inlet to the supply hose, providing a leak-resistant threaded interface. The left-hand thread direction follows the Compressed Gas Association convention for fuel gases, making it compatible with standard acetylene hose fittings and torch bodies designed to that specification.

Key Features

• Left-hand UNF thread direction follows CGA fuel gas conventions, preventing accidental cross-connection with oxygen fittings
• Brass construction provides corrosion resistance and durability in welding environments
• 5/16-inch inner diameter sized for standard acetylene hose
• 9/16-inch thread size fits common acetylene hose coupling standards
• Threaded connection type allows hand-tightening and wrench-secured assembly

Compatibility

Designed as an OEM-style replacement or new-installation fitting for acetylene hose assemblies using 9/16-inch left-hand UNF threaded connections with a 5/16-inch inner diameter hose.

Installation Notes

Installation is performed by qualified welding equipment technicians or pipefitters working on oxy-fuel gas systems. Always shut off the acetylene cylinder valve and bleed the hose pressure before removing or installing hose fittings. Left-hand threads tighten counterclockwise — do not use thread sealant or PTFE tape on welding gas fittings unless specifically approved for fuel gas service. Inspect all connections for leaks using an approved leak-detection solution before resuming operation.