http://cdn.masterlock.com/masterlock/resources/documents/pdfs/7000-0186_Blind-Flange-Lockouts-Sell-Sheet.pdf?_ga=2.109807109.1641569914.1658105231-2081762445.1656993428
Blind Flange Lockout Device, Small
The Master Lock No. S3922 Blind Flange Lockout device is a physical, best practice solution for pipeline maintenance. The adjustable cup allows for a secure fit that conceals and locks out access to nuts holding a blind in place. Workers can perform maintenance with confidence that the blind they placed on a pipeline will not be removed until all workers have removed their padlocks. 4 locking holes allow for multiple workers to lockout device at one time.