The Master Lock No. S3910 Pressurized Gas Valve Lockout Device fits virtually all valves up to 3in (76mm) diameter and works on valves with or without guarding. This patented device surrounds the gas valve handle to protect against accidental valve opening. Accepts any Master Lock or American Lock Safety padlocks and hasps – multiple workers can apply their personal safety locks.

• Surrounds the gas valve handle to protect against accidental valve opening
• Works on valves with or without guarding
• Fits virtually all valves up to 3in (76mm) diameter
• Works with any Master Lock or American Lock safety padlock or lockout hasp
• Multiple workers can apply their personal safety padlocks
• Patented