Morrison 379 2 inch NPT(M) aluminium filler cap and vent
Breather vent and filler cap with a hinged lid
• installs directly into a female threaded opening of a small storage tank
• provides direct filling access point when the hinged fill cap is in the open position
• when closed, the screened opening protects the tank from debris and insects
• lockable with a padlock
• designed for tank filling applications where a tight fill connection is not required and atmospheric venting needs to take place through the same opening
Important note: 
• tank filler caps must not be used as a substitute for proper normal and emergency venting on tanks
• it is essential that proper venting be provided in compliance with all applicable codes for every tank system