Faceplates provide for a cleaner more flush installation to give your cabinet a higher-end, more custom look. They fit a wide variety of aquarium controllers, pump controllers, and auto top-off (ATO) controllers. Some popular examples include EcoTech Marine VorTech Pump Controllers, IceCap Gyre Dual Pump Controllers, Reef Octopus VarioS and Octo Pulse controllers, along with the entire HYDROS line of smart devices, including the WaveEngine, Control 2, and Control 4.