Close and secure shipping container doors by clearing the sill and seals, following the closing order specified for that particular door set, and watching each locking-bar cam seat in its upper and lower keeper. Fasten the handle retainers and then install a lock that fits the unit’s lock box or other approved locking point; a padlock cannot compensate for a door that is not fully seated.
Prepare the shipping container doorway before moving a heavy leaf
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Watch the shipping container door cams, not just the handles
Read the gasket all the way around the opening
Secure shipping container doors with the lock box as designed
Finish with three different checks
Check the complete door and locking system
Ask the seller to show both doors closing in sequence, every cam seating in its keeper and the gaskets compressing around the opening. Confirm the fitted lock box or approved locking point before choosing a lock or accepting the unit.