Brady Red 1-Lock Glass-Reinforced Nylon Pneumatic Hose Lockouts, 7.87mm Shackle, 12mm Attachment

The pneumatic lockout is used to isolate pneumatic energy sources without the expense and inconvenience of fitting a lock valve.
It fits straight onto the connector through which any installation is connected to its source of compressed air. Can be used on most connectors of 63.5 mm, 95.2 mm or 125 mm.
The centre hole in the lockout device can be used to permanently secure the air hose. The side loops can be used to hook the end of the hose onto the lockout device.
Must be used with a padlock with a shackle diameter of 63.5 or 71.4 mm.