Morrison 379 aluminium filler cap and breather vent for tanks 2 inch NPT(M)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