Safety first, right? If you're using an oxy-acetylene torch for welding or cutting, this Hot Max flashback arrestor set is a must-have. It's designed to attach right at the torch end of your hoses, and it includes internal check valves for both oxygen and acetylene lines to prevent dangerous flashbacks from reaching your tanks. The fittings are standard 1/4\-inch (or they work with 3/16\ hoses too), so they should connect to most common torch setups. Model number is 24011. It's a simple, no-frills safety device that could save you from accidents. Lightweight, compact (about 15.5 x 5 x 12.4 cm packaged), and easy to install. Just screw it onto your torch inlets before connecting your hoses. A small investment for a big peace of mind. Always make sure your welding gear is up to safety standards!