Using a valve locking device for incidental valve isolation - Sofis valve operation
Ferrea Valve Locks | Ferrea.com
Competition valve locks: Brief guide. | Moore Good Ink
Gate Valve Lockout Device | 1 to 2-1/2 Inch Dia | 2 Pack | Hose Bib, Gas, Propane Tank, Water Spigot and Faucet Locks Outdoor | Red for Professional and Industrial Use: Amazon.com: Industrial & Scientific