This Master lock Universal Ball Valve Lockout fits into virtually all manual quarter-turn ball valve handles to protect against accidental valve opening It attaches to handle to prevent movement The lockout is suitable for confined spaces and insulated pipes Its ergonomic shape optimises tightening on the valve It has an Aluminium and Steel body and a Steel pin which fits behind the valve stopper tab Adjustable jaws hold the valve in position The Lockouts construction withstands corrosive environments and extreme conditions and is heat resistant up to 538°C