Dixon Valve Coupling MSC1540309K Acetylene Hose Coupling

Product Description

The DIXON VALVE COUPLING MSC1540309K is a brass welding hose coupling designed for acetylene gas lines. It features a 9/16-inch left-hand thread in the UNF thread standard, which is the industry-standard thread direction for fuel gas hose connections. The 3/16-inch inner diameter accommodates standard acetylene hose. Weighing approximately 0.1 pounds, this coupling is a compact, single-piece fitting suited for welding and cutting system assembly or repair. It is installed by welding professionals and gas supply technicians who work with oxy-acetylene rigs in shop or field environments.

This coupling is used in acetylene gas supply lines on oxy-acetylene welding and cutting setups. Typical applications include connecting acetylene hoses to regulators, torches, or manifold systems where a threaded, fuel-gas-rated fitting is required. The left-hand thread design prevents accidental interchange with oxygen-side fittings, a critical safety feature in any welding gas system. Suitable for both shop and portable welding rigs in light industrial and trade environments.

Key Features

• Left-hand thread direction — standard for fuel gas (acetylene) hose connections to prevent mix-up with oxygen fittings
• 9/16-inch UNF thread for secure, leak-resistant connection
• 3/16-inch inner diameter sized for standard acetylene hose
• Brass construction provides corrosion resistance and compatibility with acetylene service
• Lightweight at 0.1 pounds — easy to carry and handle in the field

Compatibility

Designed as an OEM-style replacement or service fitting for acetylene hose assemblies using a 9/16-inch left-hand UNF threaded connection with a 3/16-inch ID hose bore.

Installation Notes

Installation should be performed by a qualified welding technician or gas system professional familiar with fuel gas plumbing requirements. Always shut off acetylene supply at the cylinder valve and bleed the hose before disconnecting or installing any hose fitting. Use an appropriate open-end wrench — do not use pipe wrenches that may damage the brass fitting body. Verify thread engagement and check for leaks with an approved leak-detection solution before returning the system to service.