The T-lock turns from outside and throws the bars into the frame. The inner assembly does the same job from inside the garage. Between them they are what actually secures a manual door.
Signs it needs replacing
The key turning without the bars moving
A lock that needs forcing
Bars not reaching the frame
Sizes and variants
Variant
Specification
T-lock
External, key operated
Inner lock
Internal assembly
Replacement keys
Cut to your existing lock
Fitting notes
Sold as an assembly because the two parts have to be set together. On an automated door the motor holds the door and the lock is disengaged. Replacement keys are cut at any branch, so bring the lock or an existing key with you.