Useful tool to inspect the DK-Lok initially pulled-up.
DK-Lok depth marking tools help ensure that tubing is bottomed on the shoulder inside the DK-Lok fitting body.

Spec.
Material : Carbon Steel
Size : 1/8″, 1/4″, 3/8″, 1/2″, 5/8″, 3/4″, and 1″
Size : 6mm, 8mm, 10mm, 12mm, 16mm, and 25mm

Brief Description
DK-Lok depth marking tools help ensure that tubing is bottomed on the shoulder inside the DK-Lok fitting body.
Marking on tubing prior to make-up with DK-Lok