MV Anti Flood Shut Off and Re-Set Valves

MV Anti Flood Shut Off and Re-Set Valves


This small easy to fit, low price product will not allow more than the required amount of water through the inlet pipe to the toilet, so that if any toilet component fails, this valve will automatically shut off the water supply until assistance arrives. This is a fail-safe product that reduces the risk of flooding on board and subsequent costly damage to yacht interiors.



Flood Prevention Automatic Water Shutoff System is an excess flow, safety shut-off valve which controls the maximum continuous flow of water through it.

This function is to measure the number of gallons of water that passes through and then automatically shut off if the quantity exceeds the pre-set value - until you reset it.

If the water flow volume during a continuous run does not exceed the set value before it stops normally, Water Block automatically resets to zero and starts a new measurement cycle when the flow begins again.


For example: Water Block is installed into the water line feeding a vacuum toilet which normally uses less than a gallon per cycle.

If the appliance operates normally, it fills the bowl and shuts off and Water Block resets to zero till the next operating cycle.

However, if the appliance malfunctions or the water line ruptures, and the water continues running, Water Block will shut off when the usage reaches 1 gallon and will stay off until someone resets the valve.

Order the shut-off valve

Order the reset valve

Water Block WB-13R Features and Benefits


  • Automatic operation for a “set it and forget it” installation.
  • Requires NO electrical power. Water flowing through it is all that’s needed.
  • Suitable for both hot (158° F) and cold water.
  • Allows flow in increments of 5 to 50 litres, set at time of installation.
  • Automatically resets after every normal run cycle unless the pre-set limit has been reached.
  • Water Block must be mounted vertically with flow direction either up or down.
  • Water Flow Rate: Minimum 1 GPM, Maximum 7.9 GPM.
  • Water Block - 3/4”
  • Water Block Length: 3-1/2”
  • Expected Life: Approximately 80,000 gallons (300,000 litres) total volume before replacing.

Contact us to discuss your requirements

For more information, please contact our expert team on info@marinevac.com telephone +34 971 673 005 or fill in the form below


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