As the operator tightens the Drain Plug, the teethed print on the mobile sleeve meet the identical print located on the fix sleeve, ensuring a smooth and effective lock every time

The spring allows the mobile sleeve to slide over each tooth on the fixed sleeve, while being attracted to it at the same time.

The slackening torque can be adjusted to increase or decrease the strength. It varies according to spring's pressure, teeth gradient and friction coefficient from materials in contact.