Warning do not close this valve tags use official OSHA headers for machine safety protocol and compliance. The objective of warning do not close tags is to notify staff that there could be immediate hazard present from closing of valves. These warning 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 warning tags indicate an potentially hazardous situation, which, if not avoided, could result in death or serious injury. Durable UV resistant black nylon ties that have 50 lb. of tensile strength are included for easy attachment.