The 82-06768 is a shear coupling kit for aircraft dry air vacuum pumps, designed to connect the engine drive to the vacuum pump while protecting the pump from sudden torque spikes or mechanical overload.

It is a critical sacrificial safety component in the vacuum pump drive system: if the pump seizes or overloads, the coupling is designed to shear and prevent damage to the engine accessory drive or vacuum pump assembly.

Key features include:

Complete shear coupling assembly kit for dry air pumps
Contains coupling, external drive component, and mounting gasket (kit contents may vary slightly by configuration) 
Protects vacuum pump and engine accessory case from overload damage
Designed for Tempest 200/240/400 series dry air vacuum pumps
FAA-PMA aviation maintenance part
Common service-life replacement item in aircraft maintenance programs
Used in general aviation vacuum-driven instrument systems (attitude, heading, etc.)