As an OEM replacement seal

Simplified Testing: Features a manual trip and electrical test function

or mechanical binding that prevents the armature from pulling in

Enhanced Durability: Features internal overload protection and high-torque motor characteristics to handle fluctuating thermal loads

is set via the green spring

Johnson Controls M9220-600 Kit 322838-754 As an OEM replacement sealThe Johnson Controls M9220 600 is a heavy duty 1" Jackshaft Coupler Kit engineered for industrial grade damper actuator mounting. Specifically designed for the M9220 Series, including proportional electric spring return actuators, this kit provides a secure mechanical interface for larger shafting. It allows technicians to mount actuators on heavy duty dampers with 3 4" to 1 1 16" round shafts or 5 8" and 3 4" square shafts, ensuring slippage free