OSHA Danger Flanged Pipe Barrier Kit: Confined Space - Permit Required - Do Not EnterControl access with the OSHA Danger Flanged Pipe Barrier Kit: Confined Space Permit Required Do Not Enter. Designed to meet OSHA requirements for confined space safety, this durable barrier prevents unauthorized entry into hazardous areas. It installs easily onto flanged pipe openings without tools, while its high visibility design and clear Permit Required Do Not Enter message reinforce compliance and keep your crew protected. Key Features: Available