Magnetic Float Valve for ATO Reservoirs and RO/DI Storage Containers
The IceCap Magnet Mount Float Valve is a mechanical water level shutoff valve that stops water flow automatically when a reservoir or storage container reaches the desired fill level. It is designed for use in ATO top-off reservoirs and RO/DI storage containers, where hands-free, unattended filling is the goal and overflow prevention is the priority.
The valve works on a simple, reliable mechanical principle: as the water in the container rises, it lifts the float, which closes the valve and builds back-pressure against the supply line, stopping the flow of water. No electricity, sensors, or controllers are required. When the water level drops and the float lowers, the valve opens again and water resumes flowing. This makes it a fully passive, self-regulating shutoff that operates independently of any ATO system electronics.
The magnetic mount eliminates the need to drill holes or use permanent brackets. The mount attaches to the outside wall of the container and the valve body holds magnetically on the inside, allowing height adjustment without tools. Included tubing and a universal tubing retainer connect the valve to a standard RO/DI supply line or ATO feed line.
The IC-FS003M is particularly useful as a redundancy layer in ATO systems. If the primary ATO sensor or controller fails in a way that leaves the top-off pump running, the float valve closes mechanically before the reservoir overflows, providing a passive backup shutoff that operates independently of the electronic system.
Key Features:
- Mechanical float valve shutoff requires no electricity, sensors, or controllers to operate.
- Magnetic mount attaches to the outside of any container wall; valve body holds magnetically on the inside for tool-free height adjustment.
- No drilling or permanent installation required.
- Float rises with water level and closes the valve, building back-pressure to stop water flow at the set level.
- Valve opens again automatically when water level drops and the float lowers.
- Includes universal tubing retainer and tubing for direct connection to RO/DI or ATO supply lines.
- Functions as a passive redundancy backup in ATO systems in the event of sensor or controller failure.
Ideal For:
- ATO top-off reservoirs where a passive mechanical shutoff is needed to prevent overflow if the primary ATO sensor or pump fails.
- RO/DI storage containers where hands-free, unattended filling from the RO/DI system output is the goal.
- Hobbyists who want a non-electronic backup layer of overflow protection in their ATO or top-off setup.
- Any freshwater or saltwater container application where a self-regulating, pressure-based mechanical fill shutoff is needed.
Pro Tips:
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Use it as a backup to your ATO system, not a replacement for it. The float valve is a passive mechanical device that adds a layer of security to an existing ATO setup. It is not a substitute for a properly functioning ATO sensor and controller. The float valve's job is to catch the failure the ATO misses.
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Position the float at the fill level you want, not the overflow point. The magnetic mount makes height adjustment easy. Set the float so the valve closes at the water level where the reservoir is full but still has headroom below the rim. This gives the float room to rise and close before the container runs over.
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Check the float and tubing connection periodically for salt creep or mineral deposits. In saltwater ATO reservoirs, salt residue can build up on the float or valve body over time and affect how smoothly the float moves. A quick rinse during regular maintenance keeps the valve operating reliably.
