What is the most important function of a customs seal?
It must show clear evidence of tampering if it was opened and then reinstated.

What is a high security seal?
In addition to providing clear evidence of tampering, a high security seal must be strong and resistant to cutting, breaking and removal using common burglars’ tools.

Does the NAVALOCK fulfill those requirements?
Very much so. It is a tamper-evident seal combined with a heavy all steel locking bar.

What is a master seal?
A misleading term invented by manufacturers of a NAVALOCK "look alike" device to support their unsubstantiated claim that connecting it with a cable seal to the right door's inner handle provides special functionality, supposedly a "master seal".

NAVALOCK container security systems prove that the term "master seal" is a fiction. NAVALOCK security devices were inspected by both US and UK Customs authorities and accepted as Group 1 high security seals without the need of connecting them to the door rod handle - because the NAVALOCK is itself a seal.