The name says it all, this type of security device is applied by simply pushing into place. A fractured seal provides a instant visable evidence of entry.
Push-fit seals and closures are generally used to secure tote boxes and drum spring clamps. Unisto offer a number of push-fit products designed to close a wide range of such applications (a few of the products can be seen below).
Unisto offers a free fitting service in the UK to ensure you choose the right seal for the tote box you are working with.