Master Lock S3476 Wedge-Style Ball Valve Lockout, 1/4 in. to 1 in. Dia. Valves - John M. Ellsworth Co. Inc.
Locking Arrangment Butterfly Valve Lock Out - Lehry Valves
Ferrea Valve Locks | Ferrea.com
Amazon.com: Valve Lockout and Safety Padlock Combination Oil Gas Valve Lock Natural Gas Valve for Chemical Industry, 1-2.5 inch, Red (1) : Industrial & Scientific
Valve locking device - 420 series - G. Bee GmbH
Valve Stem Locks 3/8" Diameter - Edelbrock, LLC.
Using a valve locking device for incidental valve isolation - Sofis valve operation