The Master Lock No. S3080 Four Leg Quarter Turn Valve Lockout is designed for industries where ball valve isolation is crucial, and where handling and security must comply with lockout/tagout standards. The durable, chemical-resistant design makes it ideal for use in chemical plants, manufacturing facilities, and other environments requiring secure valve isolation. Designed for ease of use and durability, this lockout device prevents the accidental activation of closed ball valves. The adjustable design fits valves from 1/2 inch up to 2 inches (13mm to 51mm). Four locking holes accept American Lock and Master Lock safety padlocks.