The Tool Deployment Unit (TDU) is used where subsea equipment has been designed around this ISO interface. It has the advantage of giving a high degree of precision when deploying tools.
The unit conforms to the ISO interface requirements with the full range of supporting tools: including torque tool, gripper, stab plate and linear override tools.
The system is fitted to a host ROV, usually at rear, and is controlled over its own data link from a laptop computer. The operating software includes the Forum torque tool control suite with full turns and torque feedback as standard.