3390 - Acetylene Adapter - B-Size Male (LH) to 1/4 Inch NPT Male Brass Fitting

Get Connected: Reliable Acetylene Adapter for Your Rig

When you're setting up your oxy-fuel torch or organizing your gas manifold, having the right fittings in your drawer can save the day. This Acetylene Brass Adapter (B-Size Male to 1/4" NPT Male) is the piece you need when you're trying to adapt a standard pipe thread to a welding hose connection. We know that in the shop, safety is rule number one, which is why this fitting is machined with Left-Hand (LH) threads on the hose side. This simple but critical feature ensures you never accidentally hook up your fuel line to an oxygen source—a mistake that no welder wants to make.

Built from solid brass, this adapter is tough enough to handle the daily grind. It won't rust out, and it resists the dings and dents that come from being tossed in a toolbox. The 1/4" NPT Male end is perfect for screwing into regulators, solenoid valves, or custom distribution blocks. On the flip side, the B-Size Male end (9/16"-18) is the industry standard for most 1/4" and 3/16" welding hoses. Whether you are retrofitting an old machine or building a new cutting station, this adapter gives you the flexibility to route your gas exactly where it needs to go.

Installation is straightforward. The hex body gives you a good grip for your wrench, so you can tighten it down securely without stripping the edges. Just remember: since this is for Acetylene, the B-Size side tightens counter-clockwise (reverse thread). The NPT side tightens the standard way (clockwise). A little bit of gas-rated teflon tape on the NPT threads will keep everything sealed up tight. Don't let a missing ten-dollar fitting hold up a thousand-dollar job—keep a few of these adapters on hand so you're always ready to burn.

This adapter is compatible with all standard B-size Acetylene hose nuts and 1/4" NPT female ports. It's a small part, but it plays a huge role in keeping your flame steady and your shop safe. Trust in quality brass fittings to keep your gas flowing smoothly so you can focus on laying down perfect beads and clean cuts.