Showerhead Shut Off Valve with Stainless Handle, 304 Stainless Steel Mini Ball Valve(1/2" Female X Male) NPT Thread, Water Flow Control Valve Regulator Chrome, Shower Head Flow Control Valve - Amazon.com
7 Different Types of Water Shutoff Valves and How to Choose One
WaterBlock WB-13 Point-of-Use Excess Water Flow Shut-Off Valve