How the system works
Install
- Clamps onto the main shutoff valve you already have — a retrofit, no pipe cutting
- No plumber or special tools: just hand-tighten the knobs
- Most installs take 10 to 15 minutes
Detect
- AquaSensor detects water the moment it appears
- It sounds a siren immediately
- It signals AquaGuard at once through the Custos Gateway
Shut off
- AquaGuard shuts off the water automatically
- Signals travel over the Gateway’s own secure network — long range and stable
- No Wi-Fi needed
Notify
- You get a phone call, text and app alert right away
- Control the valve from the Custos Smart Home App
- AquaSensor + Custos Gateway + AquaGuard + phone app
- No subscription needed
Shop
Pick your protection.
Bundle and save. Every kit includes the free Custos app, with no subscription required.
- ✓Free shipping
- ✓30-day risk-free returns
- ✓No subscription
- ✓2-year warranty
Ultimate Protection Bundle
Whole-home protection, even during power outages: a smart shutoff valve, gateway, battery backup and five leak sensors with three cradles.
- ✓AquaGuard
- ✓Custos Gateway
- ✓AquaSensor x 5
- ✓Smart Backup Battery
- ✓Cradle x 3
- ✓Custos App
Starter Protection Kit
Essential protection for your home: a smart shutoff valve, gateway and three leak sensors, with instant call, text and app alerts.
- ✓AquaGuard
- ✓Custos Gateway
- ✓AquaSensor x 3
- ✓Cradle x 1
- ✓Custos App
Why AquaGuard
Turn the valve you already have into a smart one.
AquaGuard clamps onto your home's main shutoff valve and closes it the moment a leak is found. Here is what makes it different.
No tools. No plumber.
AquaGuard clamps over the ball valve already on your main water line. Nothing is cut or drained, and the install is fully reversible.
- Hand-tighten the knobs: no wrench, screws or pliers
- Nothing is cut or drained: your pipes stay exactly as they are
- Remove it any time without altering your valve
Sliding clamps fit everywhere.
Both clamps slide along the body, so one AquaGuard adapts to the valve in front of it.
- Adjustable span from 2.5″ to 4.9″ (64–124 mm)
- Fits ½″ to 1¼″ ball valves with no extra parts
- Two-point mounting: the clamps hold both sides of the valve
Big Clamps for big pipes.
Bigger home or a commercial main line? Big Clamps let AquaGuard fit ball valves on pipes up to 2″.
- Fits valves on pipes up to 2″, for larger homes and commercial main lines
- Swap in for the standard clamps: AquaGuard itself stays the same
- Still two-point mounting: the clamps take the turning force on both sides, so the pipe joint never carries it
Elbow adaptors for tight spots.
Main valves often sit right next to a bend. Elbow adaptors let AquaGuard mount on complex elbow pipe layouts.
- Mounts where the pipe bends right after the valve
- Horizontal or vertical elbows, on either side of the valve
- Same tool-free install: hand-tighten the knobs and you're done
Built for torque.
Old, stiff and seldom-used valves are no problem. A typical household ball valve needs only 1.5–2 N·m; AquaGuard delivers up to 10 N·m.
- Patented torque-controlled powertrain (US 11,493,141) drives a multi-stage gear train
- Auto-calibrates at setup: it measures the force your valve needs and finds its true open and shut positions
- Just the right force: never more than the valve needs, so the valve isn't damaged
- Load stays off the pipe: the two-point clamps take the turning force, not the pipe joint
Same test rig, same procedure
Plug-in leak probe.
A detection probe plugs straight into AquaGuard and watches the floor around it. When the probe gets wet, AquaGuard shuts the water off on its own.
- Ultra standalone: works offline, even when the internet doesn't
- More sensitive probe with more contact area, so water reaches a sensing point sooner
- Works alongside AquaSensors anywhere else in your home
Built for the outdoors.
Garages, crawlspaces, or a main valve on an outside wall: AquaGuard is made to live there.
- IP66 water and dust protection
- UV-resistant ASA housing: it won't fade or degrade in direct sun
- Thermal shielding keeps it working in hot and cold weather
- Sealed connections keep moisture out
Vandalism protection.
Installed where anyone can reach it? The detachable knob means AquaGuard can't simply be unclamped and taken.
- Detachable knobs: remove them once AquaGuard is clamped on
- Can't be removed or stolen without the knobs
- Ideal for outdoor and shared spaces
AquaSensor S1
A leak sensor you set once and forget.
AquaSensors sit where leaks start and tell AquaGuard the moment they touch water.
Small enough for anywhere.
AquaSensor fits in the palm of your hand, so it slips behind the washer, under sinks and next to the water heater.
- Palm-sized: fits the tight spots where leaks start
- No wires: it runs on batteries, so place it anywhere
- Instant alarm: alerts AquaGuard the moment it touches water
10-year battery life.
Set it once and forget it. AquaSensor runs up to 10 years on its batteries.
- Up to 10 years of battery life
- Works through power outages: it never depends on a plug
- Low-battery alerts in the app when it's time to replace
One sensor. Two detection points.
Add the optional cradle and external probe, and one AquaSensor watches two spots.
- Dual-point detection: cover more risk areas with one device
- Slim probe reaches tight gaps, narrow crevices and hard-to-reach spaces
- Cradle and probe sold separately
Cover the whole home.
Put a sensor wherever water runs: kitchen, bathrooms, laundry and utility room. Every one reports to the same Gateway.
- One Gateway links every sensor to AquaGuard on its own secure network
- 5 sensors in the Ultimate kit, 3 in the Starter kit
- Add more any time with sensor packs
Custos Gateway
The hub that ties it all together.
The Gateway links your sensors to AquaGuard and makes sure you hear about a leak, wherever you are.
One hub for the whole system.
The Custos Gateway links every AquaSensor to AquaGuard and sends your call, text and app alerts.
- Links every AquaSensor to AquaGuard
- Call, text and app alerts the moment a leak is found
- Status light shows at a glance that it's working
- Reports offline devices to the app
Plug in. No Wi-Fi needed.
The Gateway runs its own secure, standalone network. Wi-Fi is only used during setup.
- Secure standalone network: sensors, Gateway and AquaGuard talk directly
- Leak-to-shutoff works without Wi-Fi
- Plug it in and pair your devices in the Custos app
Flip the switch to see what keeps working in a power outage.
Smart Backup Battery
Protection that doesn't stop when the power does.
Leaks don't wait for the lights to come back on. The Smart Backup Battery keeps AquaGuard ready through an outage.
Power out? Still protected.
When the power goes out, the Smart Backup Battery keeps AquaGuard ready to shut off your water for up to 20 hours.
- Up to 20 hours of backup power for AquaGuard
- Switches over automatically: there's nothing to do
- Beeps when power changes: three beeps when it's lost, two when it's back
A smart battery, not just a battery.
Inside is more than a set of cells: the battery looks after itself so it's ready when you need it.
- Dedicated ARM processor manages the battery's life cycle for long-term health
- Thermal management keeps the cells at about 25 °C in winter, the same approach used in electric vehicles
- Status LED shows its state at a glance
Plugs in-line. Talks to AquaGuard.
It sits between the 12 V power adapter and AquaGuard's power cord, and keeps AquaGuard informed.
- Reports outages and battery level to AquaGuard over the DC power line
- Waterproof screw caps on every connection
- IP66, with UV and thermal shielding, made for outdoor installs
- Included in the Ultimate kit, or $69.99 on its own
The Custos Smart Home App
Your home's water, in your pocket.
Monitor and control your system from anywhere. Receive instant alerts, view history and manage your water protection on the go.
- ✓Shut off your water remotely, from anywhere
- ✓Instant call, text and app alerts when a leak is detected
- ✓See every sensor's status and battery at a glance
- ✓Full history of every leak, alert and valve action
- ✓Generate a Water Leak Protection Certificate for your insurer
Built for real homes
Made for the places leaks actually happen.
Built to survive the outdoors
AquaGuard and the Smart Backup Battery have IP66 water and dust protection, with UV and thermal shielding.
10-year battery life
Set your sensors once and forget about them. No yearly battery swaps.
Works through a power outage
With the optional Smart Backup Battery, AquaGuard keeps protecting your home for up to 20 hours when the power is out.
Alerts you can't miss
A push notification is easy to sleep through. Custos also calls and texts you.
Save on insurance
Save up to 15% on your home insurance.
Custos issues a Water Leak Protection Certificate directly in the app. Enter your insurance details, generate the certificate and share it with your insurance agent.
Many insurers offer 5-15% discounts for water protection systems. Ask your agent what's available on your policy.
Ready to protect your home?
Don't wait for the next leak. Protect your home, your belongings and your peace of mind in about 15 minutes, without a plumber.