STOPOUT KDD477 Glad Hand Lock Red Plastic

Safety Lockout Device

The STOPOUT KDD477 is a red plastic glad hand lock designed for universal keying on air-brake connections. It provides a visible, physical barrier that prevents unauthorised coupling during maintenance or storage. The lightweight body measures three inches deep, two inches high and four inches wide, making it easy to carry in a tool pouch. This new lockout helps fleets and owner-operators meet lockout-tagout requirements without adding bulk.

Fleet Maintenance Teams and Solo Drivers

Technicians who service heavy-duty trailers will appreciate the universal keying that allows one key to open multiple locks across a yard. Shops that standardise on a single key code reduce the number of keys each mechanic must carry. Operations that require individually keyed locks for strict access control should look at a different solution, as this model does not offer unique key codes per unit. Buyers needing metal construction for extreme environments should also evaluate alternative materials.

Air-Brake System Integration

The lock fits standard glad hand couplers on tractor-trailer air lines and requires no tools to install or remove. Its plastic body resists corrosion from road salt and moisture, preserving function through seasonal changes. By securing the connection point, it frees supervisors from verifying that lines remain disconnected during brake work or extended parking. The compact profile leaves adjacent fittings accessible for pressure checks and glad hand seal replacements.