FloodStop 3/4" & 1" Flood Protection Systems

For water heaters, water conditioners, filter systems

Water heaters, softeners, and whole house systems process or hold a lot of water, and if that water leaked out on the floor, the mess and expense could be very unpleasant. Save yourself from this frustration and cost with a simple to install FloodStop system, and relax knowing that these reliable protective devices are on the job. Find solutions to all your plumbing and household needs here at PlumbingSupply.com®!

FloodStop for Water Heaters, Filters, Residential Water Softeners

compression flood stopFS 3/4-C
(compression fittings for 7/8" outside diameter copper)

Each FloodStop system includes:
  • One Motorized Full-Port Ball Valve
    (FS-1-NPT) (1" inch NPT pipe threaded)
    (FS 3/4-NPT) (3/4 inch NPT pipe threaded)
    (FS 3/4-C) (3/4" Compression)
  • One Control Unit with Battery Backup and 30" cord to the valve
  • One Water/Leak Sensor with 7' cord
  • One Transformer: 120 Volt AC Input - 9 Volt DC Output with 30" cord
  • Power Option: Can use 4 each "AA" Batteries as Primary Power Source (batteries not included) and batteries should be installed for battery back-up when used with the 120 volt transformer
  • One 6" Output Contact Wire - for connecting an auxiliary device such as auto-dialer, X10 home automation, or home alarm system

Ordinary household fixtures or appliances can suddenly fail after years of quality service. Take water heaters for example. Normally considered a maintenance-free appliance, a water heater can often be one of the single most damaging appliances in the home if they are compromised. Everyone's water condition is different and how soon a water heater will fail cannot be accurately determined. Some water heaters will last for 25 years or more and the same identical water heater in another area may only last six or seven years before corrosion causes a leak. Since water heaters are under pressure, even a small leak can quickly flood a home. And if the leak goes undetected because you are away for the day, or out of town for a while, this situation can quickly turn into a disaster. FloodStop systems can help keep a water disaster from ruining your home as they are designed to automatically and immediately shut off the water supply to the appliance when water is detected by the leak sensor. As an added level of protection, the FloodStop system sounds an audible alarm to alert you to the leak if you're in the home, and can also be connected to existing home alarm systems, automation systems, or auto-dialers so you know what's going on while you're away.

Model Description Price & Quantity
FS 3/4-NPT-V4 3/4" Pipe Threaded - Full-Port Motorized Ball Valve (Brass) -
Works with any 3/4" MIPT supply line - rated 0-180 psi
Control Unit uses 4 x AA batteries (batteries not included)
FS 3/4-C-V4 3/4" Compression - Full-Port Motorized Ball Valve (Brass) -
Works with any 3/4" N (7/8" O.D.) copper applications - rated 0-180 psi
Control Unit uses 4 x AA batteries
FS 1-NPT-V4 1" Pipe Threaded - Full-Port Motorized Ball Valve (Brass) -
Works with any 1" MIPT supply line - rated 0-140 psi
Control Unit uses 4 x AA batteries

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Optional Accessories

Model Description Price & Quantity
FSTEW Transformer Extension Wires for Water Heater FloodStops (86" length) $7.50
FSC2VEW Controller to motorized ball valve extension wire
extends reach by 9 feet

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More Information About This FloodStop System

FloodStop system - water heater installation
Sample Installation
(actual installation may differ)

While most commonly used for water heaters, these 3/4" and 1" FloodStop valves are can also be used for water softeners or filters or anywhere else you may need to automatically turn off the water supply in case of a leak. FloodStops can easily be installed within fifteen minutes, making them a simple addition to your home protection plan.

These FloodStop kits are designed to automatically and immediately shut off the water supply to the water heater, filter, water softener, or other appliance or plumbing fixture you are protecting when water is detected by the leak sensor. The sensor then signals the control unit to close the motorized full port ball valve and at the same time sound an alarm to alert you. Two extra output contacts are included to allow the FloodStop control unit to connect to existing home automation devices, auto-dialer systems, or your whole house alarm system, so if you are out of town, you or someone you trust, could still be notified.

Since only the protected appliance water supply will be turned off, all your other household fixtures and appliances will continue to operate as normal. However, if these are used on a water softener or whole house filter that is connected to the main line, the entire water system will be shut off at the location of the motorized ball valve.

FloodStops are powered by a 120 volt AC input - 9 volt DC output transformer and includes an option for battery back-up or can be fully operated and powered by 4 each "AA" sized batteries (not included) if an electrical outlet is not advantageously available.

To reset the system after the problem has been fixed, simply wipe the sensors dry and press the green "open" button on the control unit.

1-Year Manufacturer's Warranty

Certified safe for drinking water applications.

Basic FloodStop operation - 5 simple steps:

  1. FloodStop valve installed between the appliance or plumbing fixture and its manual shutoff valve
  2. Water leak sensor is placed at the base of the appliance (or plumbing fixture)
  3. Valve stays open until water loss is detected
  4. Water on sensor closes FloodStop valve and sounds alarm
  5. Valve stays closed until problem is repaired and system is reset

Please always make sure that you take the precaution of following the regular maintenance and inspections (included in your FloodStop package) required to ensure that you are protected.


  • Brass Motorized Ball Valve
    (FS-1-NPT) (1" inch NPT pipe threaded) - 3-13/16"(L) x 4"(H) x 1-3/4"(W)
    (FS 3/4-NPT) (3/4 inch NPT pipe threaded) - 3-3/8"(L) x 3-3/4"(H) x 1-3/4"(W)
    (FS 3/4-C) (3/4" Compression) - approx 3-3/4"(L) x 3-3/4"(H) x 1-3/4"(W)
  • Control Unit with Battery Backup and 30" cord to the valve - 4-3/4"(L) x 4-3/4" (H) x 1" (W)
  • Water/Leak Sensor with 7' cord - 7-1/2"(L) x 1-1/4"(W) x 1/8"(H)

Note: FloodStops can help prevent flooding, but do not provide 100% guaranteed flood protection. We cannot be held liable for any damages that may occur when flood stops are installed. Always refer to the owner's manual and perform maintenance per the manufacturer's recommendations.

flexible supplies for water heaters

Related Items & Accessories

Frequently Asked Questions

Q. "How does it work?"
A. Simple! You'll install a FloodStop motorized ball valve(s) upstream of each supply line and place our water sensor on the floor behind the unit that needs detection. If water leaks due to a broken line or the failure of ANY internal component of your plumbing fixture, the control unit tells the motorized ball valve(s) to shut off the water and sound an alarm.

Q. "So these systems can help prevent leaks or flooding?"
A. They really can't help prevent leaks. They can help prevent flooding by shutting off the water if a leak happens.

Q. "If there is no electricity running to the valve (either because they haven't been hooked up or the sensor has touched water), are the valves normally open or closed?"
A. In their normal position, the FloodStop valves are open and will allow water to pass through; once water touches their sensor, the motorized ball valve is tripped and the valves are closed. The valve(s) will remain closed until the sensors are dried and the reset "Open" button is pressed. The Controller has a battery port for 4 X AA size batteries, which will serve as a battery backup in case of a power outage. The same batteries will serve as the primary power source if a nearby electrical outlet is not available (battery life 1 year).

Q. "Does the FloodStop system shut off water to the whole house?"
A. No, this is a point of use product; it only shuts the water off at the source of the leak. Why shut off the water to your whole house if the cause of the problem is just at the water heater, for instance? Whole house systems are much more expensive and usually require a plumber to install.

Q. "What should I do after the system has detected a leak?"
A. If a leak has occurred, turn the manual valve(s) to the off position, investigate and repair/stop the leak, dry the sensor, and reset the controller by pressing the "Open" button.

Q. "Are FloodStop systems difficult to install?"
A. No, if you can install a garden hose, you can install FloodStop. Installation doesn't take long, and your home will be protected against many sources of water damage.

Q. "Why would I need to use the transformer extension wire?"
A. Unlike the washing machine and the icemaker, the water heater is not always located next to an electrical outlet, and so you may need to use the approximate 7-foot-long (86") low-voltage extension wire.

Q. "Why would I need an additional sensor?"
A. You can increase your area of protection by adding extra sensors near the fixtures or appliances you have selected to protect. If you want more protection for your water heater, additional sensors can be placed in your water heater's drain pan, as well as on the floor nearby (in case a leak sprays outside the pan), for example.

Q. "What about braided hoses, aren't they burst proof?"
A. You should use braided hoses whenever you can (especially on your washing machine), and take every precaution to avoid water damage, but hoses are not the only source of flooding. And, braided hoses are not burst proof, but only burst resistant. There are a wide variety of clamps, valves, pumps, drains, etc. inside many fixtures that can fail. (FloodStop was designed after the inventor suffered a home flood due to a switch failure that did not tell his washing machine when to stop filling with water. Water continued to run into the washer and flooded the house for 3 hours before it was discovered).

Q. "I'm hearing a lot about lead-free these days. What does that have to do with plumbing products and how does the new lead-free legislation affect me?"
A. Basically, the laws implemented Jan. 1st, 2014 require plumbing products that come in contact with drinking water to be "essentially lead free" (less than 0.25% weighted average). For further information about how the law determines what is "lead free", rules regarding which plumbing products must be "lead free", and who these laws will affect, please view our page.

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