Brass Craft has introduced Safety+PLUS, a new line of automatic gas shut-off valves. Utilizing a patented, magnet-based excess flow valve design, Safety+PLUS shuts off the flow of gas to the appliance in the event of a major gas leak. The valve shuts the gasoff only at the appliance where the problems exists, allowing the rest of the gas system to continue functioning. Once the problem is corrected, the valve will automatically reset, resuming appliance performance and continued protections. Brass Craft.