Caution do not close this valve tags use official OSHA headers for machine safety protocol and compliance. The objective of caution do not close this valve tags is to notify staff that moderate or minor injury could occur from closing of valve. These caution do not close this valve tags are useful tools to help protect the health and safety of personnel, but are not a substitute for required protective measures for eliminating or reducing hazards. These tags comply with the OSHA 1910.145 standard, where the caution tags indicate hazardous situation that, if not avoided, could result in minor or moderate injury. Durable UV resistant black nylon ties that have 50 lb. of tensile strength are included for easy attachment.