The glass gallon lids I'm thinking of have the rubber ring on the underside like traditional canning jar lids and 16 oz glass jars of salsa.
Those plastic gallons are rated for hot fill! Cool!!!! First time seeing those.
Newks may want to check with the PA to make sure those would be ok for shelf stable status. The restaurant would probably appreciate not having to refrigerate 20 gallons, but hey, if they have the room.... :shrug: