The AG-1100+ is incredibly easy to install. It can be mounted to the drain pan in 10 seconds or less. Installation does not require any pre-drilling for screws. The AG-1100+ incorporates a protective cover to keep out insulation and debris that could prevent the float from rising. Normally Open 3rd Wire for Optional External Alarm, Digital Controller, or Energy Management System Residential and Commercial High Capacity 5 Amp, 24Volt AC Magnetic Float Switch, Easy, Drill-Free Installation Pull Up Test Knob Protective Cover UL 508 Approved