The INGERSOLL RAND ML50K-445 is a housing gasket used in MLK Series air chain hoists, including the ML250K, ML500K, and ML1000K models. It seals the mating faces of the hoist housing so compressed air stays in the motor circuit instead of bleeding out at the joint. A flattened or cracked gasket is a common cause of air loss and sluggish hoist response, making it a routine replacement during motor teardown and seal kit service.