Greenfield Asv050 1/2" Automatic Security Valve. This automatic security valve features a 1/2" inlet, a 316 stainless steel construction, and it comes with both a manual handle and a power supply. This model works with HAI panels, and is UL listed. Connecting our automatic security valve to your automation system allows you to control your water or gas supply remotely, and it works great in conjunction with systems that already have water or gas sensors. It is fast-opening and -closing, and significantly reduces water damage or gas leaks.