Industrial PRO1 T150 Universal Thermostat Guard

The PRO1 T150 Universal Thermostat Guard locks and shields thermostats in commercial and public environments, preventing unauthorized adjustment while keeping the thermostat display and controls visible for quick verification. Designed to fit all PRO1 thermostats and most modern models, it installs by surface mounting without removing the existing unit and can be oriented horizontally or vertically to suit your wall layout. Constructed from clear non-yellowing plastic, the guard features a snap-on clear cover, a keyed locking mechanism with two included keys, and a ring/solid base (version depending) to secure around the existing mounting. Inside dimensions are 7.25 in W × 5.5 in H × 2.625 in D, outside dimensions are 7.25 in W × 5.5 in H × 2.5 in D, and the overall weight is approximately 0.84 lb (0.38 kg). This guard is suitable for commercial and residential HVAC systems and is commonly used in offices, schools, multifamily housing, restaurants, hotels, healthcare facilities, churches, and public buildings where temperature settings must remain secure and consistent. Optional PLEASE DO NOT TOUCH Display Insert is available; mounting hardware and anchors are included, and replacement key part number is T150K. Related replacements include Honeywell CG511A Thermostat Guard and Robertshaw 300-204 Thermostat Guard.