Honeywell International SM THERMSTAT COVER/GUARD

Ultra-clear chemical and UV-resistant acrylic resin cover and base resist yellowing. Secure, tumbler type key lock; key removable only in locked position. Double-wall barrier in ring base blocks thermostat tampering tools, yet allows air circulation. Ring base mounts directly over existing thermostat; no removal required. Meets or exceeds UL pry test and impact test standards. Keyed alike. No. CG511A1000: Fits most small and medium size thermostats, 9-1/2" W. x 11" H. x 3" D. No. CG512A1009: Fits most medium and large size thermostats, 12" W. x 11" H. x 3.25" D.