OSHA Danger Flanged Pipe Barrier Kit: Confined Space - Permit Required - For EntryComply with entry procedures using the OSHA Danger Flanged Pipe Barrier Kit: Confined Space Permit Required For Entry. This high visibility, heavy duty barrier system helps ensure compliance with OSHA regulations by marking confined spaces that require entry permits. With a U shaped flange hook design, the barrier installs quickly without tools, making it ideal for fast deployment on job sites. Bold striping and clear warning language stop