Honeywell TG511A1000 Clear Thermostat Guard

Sturdy, tumbler-type key lock keeps thermostat settings secure. Comes with a double-wall barrier in the ring base, which blocks thermostat tampering tools, yet allows excellent air circulation. Ring base mounts directly over existing thermostat which saves time and reduces installation headaches. Exceeds UL pry test, UL873 54.1B, and impact test, UL873 54.1C standards. Ultra clear acrylic resin cover and base resists the yellowing effects of chemicals and UV-light.