Clamp the valve on. Place your 3 sensors.
Lives outdoors
Sun, rain, freeze — shielded.
The math
One leak. $15,400.
14,000U.S. water damage incidents, every day
1 in 67insured homes file a claim yearly
$15,400average payout per claim
$15,400
vs
$349
— once. no subscription.
What’s in the box
Everything in one box.
×1
AquaGuard Smart Shutoff
Clamps onto your main valve and closes it the second a leak is detected.
×1
Custos Gateway
Connects every device to the cloud and dispatches all alerts, 24/7.
×3
AquaSensor-S1 Leak Sensors
Water heater, laundry, under the sink — up to 10-year battery life each.
×1
Smart Backup Battery
Keeps the system guarding for up to 20 hours through a blackout.
×1
Water Detection Probe
Wired probe at the valve — shuts off water even with zero internet.
app
Custos App
Alerts, remote control, and your insurance certificate. Free forever.
How it works
Fifteen minutes to protected.
It learns your valve, then stands guard.
Leak? Valve shuts. Phone rings.
Built different
Wins where others stall.
10 N·m
Torque that wins
Turns stiff, rusted, decades-old valves.
10 yr
Sensor battery life
Each AquaSensor-S1 runs up to 10 years on 2× AA.
IP66
20 hr
Blackout protection
Backup battery included — up to 20 hours without grid power.
Zero internet? Still protected.
Devices talk over the UBILINK@LoRa mesh, and the wired probe closes the valve all on its own.
Fits the awkward pipes, too
Oversized valves, elbow pipes, up to 2″ with Big Clamps.
Anti-theft knobs
Can’t be removed by strangers.
4-ch
Alerts that find you
Call, text, push, email — Gateway included in this bundle.
Why retrofit wins
No pipe cutting. That changes everything.
Most smart shutoff valves must be cut into your plumbing by a professional. The Custos system clamps onto the valve you already own.
| Ultimate Bundle | Pipe-cut valves | Sensors only | Do nothing | |
|---|---|---|---|---|
| Install | 15-min DIY clamp-on | Plumber, $150–$500 | Place them anywhere | — |
| Auto shutoff | ✓ Valve closes itself | ✓ Yes | ✗ Alerts only | — |
| Coverage | ✓ Valve + 3 sensors + probe | Valve only | Sensors only | — |
| Power outage | ✓ Up to 20 hr backup | Varies, often none | Battery sensors still alert | — |
| Subscription | ✓ Never | Often required | Varies | — |
| A leak costs | A notification | A notification | A race home to the valve | $15,400 avg |
Details
Specs & questions.
Technical specifications
| System install | ~15 minutes, tool-free DIY |
| Torque | Up to 10 N·m, smart adaptive |
| Valve types | Standard ball valves |
| Pipe size | ½″–1¼″ · up to 2″ with Big Clamps |
| Leak sensors | 3× AquaSensor-S1 · up to 10-yr battery |
| Wireless | UBILINK@LoRa mesh · up to 400 ft |
| Backup power | Smart Backup Battery · up to 20 hr |
| Probe | Wired water detection probe, included |
| Protection | IP66 · UV · thermal |
| Warranty | 18 months + lifetime support |
Do I need a plumber or tools?
No. The valve clamps on, sensors sit where you place them, and the whole system is running in about 15 minutes. It comes right off if you move.
Will it fit my valve?
It fits standard ball valves on ½″–1¼″ pipes out of the box, and up to 2″ with the optional Big Clamps kit. Elbow-pipe adapters are available too.
What if Wi-Fi or power goes out?
Devices talk over their own UBILINK@LoRa mesh — Wi-Fi is only used for cloud alerts. The wired probe closes the valve with zero internet, and the included backup battery keeps guarding for up to 20 hours in a blackout.
Is there a subscription?
Never. All alerts — call, text, push, email — plus app control and the insurance certificate are free, forever.
What’s in the box?
1× AquaGuard smart shutoff actuator, 1× Custos Gateway, 3× AquaSensor-S1 leak sensors, 1× Smart Backup Battery, 1× wired Water Detection Probe. The Custos App is a free download.
More ways to start
Not ready for Ultimate?
Start smaller — every kit works with the same app and grows into the full system.
Starter Protection Kit
Smart shutoff valve, Gateway, 1 leak sensor and the wired probe. Automatic shutoff and full alerts — add sensors or the backup battery anytime.
$269one-time
Buy Now
Smart Water Sensor & Gateway Bundle — 4 Pack
4 battery-operated leak sensors + Gateway. Call, SMS, email & push alerts the moment water appears — add AquaGuard later for automatic shutoff.
$161.56one-time
Buy Now
Our guarantee
18-month warranty
Lifetime tech support.
Free shipping
Every order.
US Patented
Powertrain + mounting.
Insurance savings
Up to 15% off premiums.
One box. Whole-home protection.
The average water damage claim is $15,400 — 44× the price of this bundle.
Buy Now — $349 →Free shipping · No subscription · 18-month warranty