Neptune Systems Apex ATK V2 Automatic Top-Off Kit (ATO) Intelligent Automatic Top-Off Protection—With or Without an Apex Controller Maintain a stable water level and salinity with the Neptune Systems Apex ATK V2 Automatic Top-Off Kit. Designed with multiple layers of protection, the ATK V2 delivers reliable, intelligent top-off automation for both freshwater and saltwater aquariums. Unlike many automatic top-off systems, the ATK V2 works right out of the box without requiring an Apex Controller. Using the included Fluid Monitoring Module (FMM), optical sensors, mechanical backup float valve, and intelligent safety programming, the ATK V2 provides dependable water level control from day one. For hobbyists who already own an Apex Controller—or plan to upgrade in the future—the ATK V2 seamlessly integrates with the Apex ecosystem, unlocking advanced monitoring, notifications, automation, and remote management through Apex Fusion. Whether you're protecting a nano reef, large reef system, freshwater aquarium, or planted tank, the Neptune ATK V2 offers premium performance and peace of mind. Features Works as a standalone automatic top-off system Fully compatible with Apex Controllers Includes Fluid Monitoring Module (FMM) Dual optical water level sensors Mechanical backup float valve for added safety Intelligent IQ-Fill technology helps prevent overfilling Includes Neptune PMUP V2 utility pump Easy plug-and-play installation Compatible with freshwater and saltwater aquariums Apex Fusion integration when connected to an Apex Controller Benefits ✔ No Apex Controller required ✔ Maintains stable water levels automatically ✔ Helps keep salinity stable in reef aquariums ✔ Multiple redundant safety features for added protection ✔ Simple installation with intelligent operation ✔ Expandable for advanced Apex automation and monitoring What's Included Apex ATK V2 Automatic Top-Off Kit Fluid Monitoring Module (FMM) PMUP V2 Utility Pump Two Optical Water Level Sensors Mechanical Float Valve Tubing and Mounting Hardware Power Supply Installation Accessories Perfect For Reef Aquariums Freshwater Aquariums Planted Aquariums Marine Aquariums Nano Tanks Large Display Systems Specifications Brand: Neptune Systems Model: Apex ATK V2 Type: Automatic Top-Off System (ATO) Controller Required: No (Standalone Operation) Controller Compatible: Neptune Apex Application: Freshwater & Saltwater Aquariums Shipping Information Shipping Class: Medium Shipping Orders are typically processed within 1–3 business days (excluding weekends and holidays). Shipping rates are calculated at checkout based on the size and weight of your order. Most medium-sized aquarium equipment ships via UPS, FedEx, or USPS and typically arrives within 5–8 business days after shipment. Tracking information will be emailed as soon as your order ships. Why Shop with Infinity and Beyond Aquatics? At Infinity and Beyond Aquatics, we're hobbyists first. We carefully select premium aquarium equipment from trusted manufacturers to help you build and maintain a thriving aquatic ecosystem. When you shop with us, you'll enjoy: Genuine products from authorized suppliers Competitive pricing on premium aquarium equipment Secure checkout and fast order processing Expert customer support from fellow aquarium enthusiasts Assistance before and after your purchase Whether you're building your first aquarium or expanding an advanced reef system, we're here to help every step of the way. Returns Returns are accepted on eligible new and unused items in accordance with our Return Policy. Please contact us if you have any questions before initiating a return. Have Questions? Need help choosing the right automatic top-off system for your aquarium? Contact us before ordering—we're happy to help you find the perfect solution for your setup.
