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Neptune I/O Breakout Box reef h20 accurate and cost-effective way toAdd the I O Breakout Box to your current aquarium controller an easy way to connect up to six external switch inputs. The breakout box is compatible with any Apex Controller. Float Switches for sump alerts or ATO (Auto Top Off) Push Buttons for special feed, cleaning, ect. modes Leak Detectors Magnetic switches on cabinets for intrusion detection Customize your Neptune Apex Controller with the I O Breakout Box. Add float switches, magnet switches, or