Protect Against Burst Flexi Hoses
A flood stop isolation valve provides an additional layer of protection against sudden high-flow water loss caused by a failed flexible hose or plumbing connection.
JR Gas & Water can supply and install flood stop isolation valves to suitable toilets, basin mixers, kitchen mixers and other fixtures using flexible water connections throughout Greater Brisbane and the Gold Coast.
Unlike a standard isolation tap, a flood stop valve is designed to respond to an abnormal increase in water flow and shut the water supply to the connected fixture.
This can help reduce the amount of water released if a flexi hose suddenly bursts while the property is unattended.
What's Included?
Our standard flood stop isolation valve replacement or installation includes:
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Supply of a flood stop isolation valve
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Removal of the existing accessible isolation valve where required
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Installation onto the existing suitable water connection
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Connection to the existing flexi hose or fixture connection
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Testing of the new valve
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Leak testing under mains water pressure
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Operational check
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Basic clean-up of the immediate work area
Where an existing flexi hose is old, corroded or unsuitable for reuse, replacement of the hose should also be considered.
Flood Stop Valve Technical Details
The flood stop isolation valves used for this service are designed for standard 15mm plumbing connections.
Typical product specifications include:
Flood Stop Closing Test
Manufacturer testing for the flood stop valve shows:
| Test pressure |
Flood-stop closing flow |
| 300 kPa |
9.08 L/min |
| 500 kPa |
9.07 L/min |
These figures represent the tested flow rate at which the valve's flood-stop mechanism operates under the nominated test pressures.
They should not be interpreted as the normal water consumption of the connected fixture.
How Does a Flood Stop Isolation Valve Work?
Under normal operation, water passes through the valve to the connected tap, toilet or fixture.
If the downstream connection experiences an unusually high and sustained flow — such as may occur when a flexi hose bursts — the internal flood-stop mechanism is designed to close and restrict the water supply.
The valve therefore protects the individual water connection it is installed on rather than shutting down the entire property.
Where Can Flood Stop Valves Be Installed?
Flood stop isolation valves can be suitable for many common household water connections, including:
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Toilet cistern flexi hoses
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Bathroom basin mixers
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Kitchen sink mixers
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Laundry mixers
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Some appliance connections
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Other compatible flexible water connections
Installation suitability depends on the existing plumbing, available space and the type of fixture being connected.
Ideal for Toilet Flexi Hose Protection
Toilet cistern flexi hoses are permanently pressurised whenever the property's water supply is turned on.
That means a burst hose can continue releasing water until the property's main water supply is isolated.
Installing a flood stop valve at the toilet connection provides additional protection directly at this potential failure point.
For older properties, it can also make sense to inspect and upgrade the flexi hose at the same time.
Flood Stop Valve + New Flexi Hose
For the best result, we recommend considering the valve and flexi hose as one system.
A flood stop valve helps protect against a sudden high-flow failure, while replacing an ageing or deteriorated flexible hose addresses one of the components most likely to cause the problem in the first place.
JR Gas & Water can replace both during the same visit where required.
Flood Stop Valve vs Standard Isolation Valve
A conventional isolation valve allows the water supply to a fixture to be manually turned on and off.
A flood stop valve adds an automatic high-flow shut-off mechanism.
A flood stop valve does not replace the need for a functioning isolation valve or properly installed plumbing. It is an additional safeguard designed to limit water flow under specific failure conditions.
What a Flood Stop Valve Won't Protect Against
Flood stop valves are intended to respond to abnormal flow conditions.
They may not activate for:
They should therefore be considered one part of a property's overall plumbing protection rather than a guarantee against water damage.
Existing Plumbing Conditions
Installation relies on the existing plumbing being suitable for connection.
Additional work may be required where we find:
We'll identify any additional work required before proceeding where reasonably possible.
What's Not Included?
Standard installation does not include:
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Relocation of water points
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Replacement of taps or mixers
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Replacement of toilet cisterns
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Wall or cabinetry modifications
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Repair of damaged pipework
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Water damage repairs
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Waterproofing repairs
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Electrical work
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Access through walls, floors or cabinetry
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Rectification of unrelated plumbing defects
Should I Install Flood Stop Valves Throughout My Home?
Properties can contain a surprising number of flexible water connections.
Common locations include toilets, bathroom basins, kitchen sinks and laundries.
For homeowners looking to reduce the risk associated with burst flexi hoses, installing flood stop valves on multiple suitable connections can provide greater protection than installing one valve in isolation.
JR Gas & Water can assess accessible fixture connections and replace multiple isolation valves during the same visit.
Frequently Asked Questions
Does a flood stop valve stop a burst flexi hose?
It is designed to detect an abnormally high downstream flow and shut or substantially restrict the water supply.
It can significantly reduce water loss from certain sudden hose failures, although no individual valve can protect against every type of leak.
Does it replace the flexi hose?
No. The flood stop valve and flexible hose are separate components.
If the existing flexi hose is ageing, damaged or corroded, we may recommend replacing it at the same time.
What pressure does the flood stop valve work at?
Manufacturer closing tests show approximately 9.08 L/min at 300 kPa and 9.07 L/min at 500 kPa.
Does it shut off the whole house?
No. It generally protects only the water connection downstream of that particular valve.
Can you install them on toilets?
Yes. Toilets are one of the most common applications because the cistern flexi hose remains under mains pressure.
Can you install them under kitchen and bathroom sinks?
Yes, provided the existing connection and available space are suitable.
Can you install several in one visit?
Yes. Multiple suitable fixtures can generally be upgraded during the same booking.
