The Mansfield 001238891 Cover Lock Assembly is a genuine replacement part designed for Mansfield Alto tanks with locking lids. Here are the details:

• Function: This assembly serves as the hardware kit for the lock on the tank lid.
• Components:
  • Chrome Nut: The nut sits on top of the lid and has a hex wrench socket.
  • Back Tank-to-Bowl Bolt Replacement: This assembly replaces the standard back tank-to-bowl bolt to prevent the tank lid from being removed for security or safety reasons.
• Purpose: It ensures that the tank lid remains securely in place.
• Compatibility: Specifically designed for Mansfield Alto toilets with locking lids.