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  • First Alert L5 WiFi Water Leak Shutoff Valve
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Last updated September 2026

First Alert L5 WiFi Water Leak Shutoff Valve

A brass ball valve with a motorized actuator, a built-in sensing cable and Wi-Fi alerts, with no smart-home platform support beyond its own app.

4.2
3 ratings
$284.60
As an Amazon Associate I earn from qualifying purchases
Launch Year: 2022

Model: VWS02Y-3/4

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Our review

First Alert L5 WiFi Water Leak Shutoff Valve Review: A Plumbed-In Valve With Its Own Leak Cable

The verdict

The First Alert L5 WiFi Water Leak Shutoff Valve (VWS02Y-3/4) is an inline shutoff valve: a lead-free 3/4 in NPT brass ball valve with a motorized actuator that closes the main line when its 5 ft sensing cable gets wet or when a paired First Alert leak detector reports water. It suits homeowners who want an automatic main-line shutoff managed from one app, and it comes in four pipe sizes. The trade-offs are that it must be plumbed in, it is indoor only, it has no battery backup and it works only with the First Alert app, with no Alexa, Google Home, Apple Home, SmartThings or Matter support. It is also mostly sold through plumbing and HVAC professionals, so the price at retail is firmly in premium territory.

Best for
  • Homeowners with a main line to protect
  • Basement and utility room leaks
  • Second homes and rentals
  • Plumber-installed projects

Pros

  • Includes a lead-free NPT ball valve, so no existing valve is needed
  • 5 ft sensing cable included and extendable to 500 ft
  • Pairs with up to 30 First Alert WiFi leak detectors
  • Closes in under 10 seconds with 5 N·m of rated torque
  • Scheduled maintenance cycle keeps the valve from seizing
  • Manual override handle for power cuts
  • Four pipe sizes from 1/2 to 1-1/4 inch
  • Five-year limited warranty

Cons

  • Must be plumbed into the main line, ideally by a plumber
  • No flow sensor or automatic micro-leak test
  • No battery backup
  • Works only with the First Alert app, with no Alexa, Google Home, Apple Home, SmartThings or Matter
  • Indoor use only
  • Freeze alerts need a separate L1 detector

Who is the First Alert L5 WiFi Water Leak Shutoff Valve for?

The L5 is for a house where the main water line is accessible indoors and someone is willing to cut it open (or hire a plumber). Unlike a retrofit actuator that clips onto a valve you already own, it ships with its own lead-free ball valve, which is cut into the pipe after the main shutoff and the pressure reducing valve. The same design is offered in 1/2, 3/4, 1 and 1-1/4 inch NPT sizes, so it can match most residential mains. It is meant for domestic cold water, indoors, on systems without an external hot water source.

What the L5 offers

The headline feature is the included 5 ft sensing cable, which plugs into the actuator and tells it to shut the water off when it gets wet; more cables can be linked to stretch coverage up to 500 ft. On top of that, up to 30 First Alert WiFi leak detectors can be paired, and the app lets you pick which of them are allowed to trigger the shutoff. The actuator is rated at 5 N·m of torque (6.5 N·m breakaway) and turns the valve in under 10 seconds. A maintenance cycle closes and reopens the valve on a schedule so it does not seize, and the app shows the valve state and sends leak alerts. A manual emergency handle on the actuator lets you close or open the valve by hand during a power cut.

What to know before you buy

There is no flow sensor and no automatic leak test, so the L5 reacts to water it touches or to a paired detector, not to abnormal flow behind a wall. It runs on a 15 V adapter with no battery backup, and the emergency handle does not sync the valve position with the app. Connectivity is 2.4 GHz Wi-Fi plus Bluetooth for setup, with no hub and no Zigbee, Z-Wave or Thread. The manufacturer documents control through the First Alert app only, and its spec sheet does not list Matter. It is rated IPX4 but is indoor only. Freeze alerts come from the separate L1 detector, not from the valve itself. And since the product is distributed mainly to pros, availability and pricing vary by supplier.

Is the First Alert L5 worth it?

For a plumbed-in valve with a built-in leak cable and a five-year warranty, the L5 is a straightforward way to add automatic shutoff to a main line, and the paired-detector system scales to a whole house. It costs more than retrofit actuators because the valve is part of the package. If you want voice control, Matter or flow-based leak detection, look at the other valves in this category; if you want a simple, certified (NSF/ANSI 61 and 372) shutoff run entirely from one app, the L5 does that.

Frequently asked questions

Does the First Alert L5 need a hub?

No. It connects directly to 2.4 GHz Wi-Fi and uses Bluetooth for setup, and it is controlled through the First Alert app.

Does the L5 work with Alexa, Google Home or Apple Home?

The manufacturer documents control through the First Alert app only, and the spec sheet lists no Matter support, so it does not offer Alexa, Google Home, Apple Home or SmartThings control.

Which pipe sizes does the L5 come in?

The VWS02Y family is sold with 1/2, 3/4, 1 and 1-1/4 inch NPT ball valves. This listing is the 3/4 inch model.

Does the L5 detect leaks by itself?

Yes. The included 5 ft sensing cable plugs into the actuator and closes the valve when it gets wet, and extra cables extend the coverage. It can also be paired with up to 30 First Alert WiFi leak detectors.

What happens to the valve during a power outage?

The actuator has no battery backup and stays where it is. Unplug it, then use the emergency handle to turn the valve by hand; that handle does not update the position shown in the app.

Is the L5 a retrofit actuator?

No. It is an inline valve: the supplied ball valve is plumbed into the line and the actuator clips onto it.

At a glance

Summary

Everything this water shutoff valve supports, grouped by category.

Size & Materials
Weather Resistance4.7 × 2.7 × 5.7 in (119 × 68 × 144 mm)
Power
Wired
Connectivity
2.4 GHz WiFiBluetooth
Valve & Installation
Installation Type (Inline valve)Pipe Sizes (1/2", 3/4", 1", 1-1/4")Motor Torque (5 N·m)Valve Exercise
Leak Protection
Wired Leak SensorFreeze Alerts (Sold separately)

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Company
First Alert logo

First Alert

3.5/ 5 avg ratingUnited States flagHeadquartered in United States

First Alert is an American home safety brand owned by BRK Brands, specializing in smoke alarms, carbon monoxide detectors, fire extinguishers and combination smoke and CO alarms. Its smart lineup includes Wi-Fi connected smoke and CO alarms that send mobile alerts and work with Google Home, managed through the First Alert app. First Alert focuses on reliable, widely certified fire and CO safety products for the home.

Full specifications

Every spec, organized

Browse the full breakdown by category. Tap the on any row for what it means, or the for sources and documentation.

Size & Materials
Weather Resistance

YES

Rated IPX4, but designed for indoor use only (UL type 2).

Dimensions

4.7 × 2.7 × 5.7 in (119 × 68 × 144 mm)

Length x width x height of the 3/4 in model including its ball valve, from the manufacturer's dimension table (118 x 68 x 64 mm for the actuator alone).

Weight

?

Power
Wired

YES

Powered by a 15 V adapter (100-240 V input) with a 10 ft cord.

Battery Type

-

Battery Life

-

Battery Backup

NO

No battery is listed. During a power outage the manual says to unplug the actuator and use its emergency handle; that handle does not sync the valve state with the app.

Connectivity
2.4 GHz WiFi

YES

802.11 b/g/n at 2.4 GHz.

Bluetooth

YES

Bluetooth 4.1; a long press of the power button starts Bluetooth broadcasting for setup.

Z-Wave

NO

Zigbee

NO

Thread Protocol

NO

Other

NO

Integrations
Google Home

NO

The manufacturer documents control only through the First Alert app; no third-party platform is claimed.

Alexa

NO

The manufacturer documents control only through the First Alert app; no third-party platform is claimed.

Apple HomeKit

NO

The manufacturer documents control only through the First Alert app; no third-party platform is claimed.

Samsung SmartThings

NO

The manufacturer documents control only through the First Alert app; no third-party platform is claimed.

Home Assistant

?

Matter

NO

The specifications list Wi-Fi 2.4 GHz and Bluetooth 4.1 only, with no Matter support.

Valve & Installation
Installation Type

Inline valve

Ships with a lead-free NPT ball valve that is plumbed into the main line, after the main shutoff and the pressure reducing valve; the actuator then clips onto it.

Pipe Sizes

1/2", 3/4", 1", 1-1/4"

Sold as VWS02Y-1/2, VWS02Y-3/4, VWS02Y-1 and VWS02Y-11/4, each with its own NPT ball valve.

Motor Torque

5 N·m

Rated torque 5 N·m (44.25 in-lbs), breakaway torque 6.5 N·m, runtime under 10 seconds for a 90 degree turn.

Valve Exercise

YES

A configurable maintenance cycle closes and reopens the valve on a schedule; First Alert recommends at least every 2 months. It does not run while the valve is closed.

Leak Protection
Flow Sensor

NO

Micro-Leak Test

NO

Offline Auto Shutoff

?

Wired Leak Sensor

YES

Includes a 5 ft sensing cable plugged into the actuator that shuts the water off when it detects a leak; more cables can be linked to extend coverage to 500 ft.

Freeze Alerts

Sold separately

The valve has no temperature sensor of its own; freeze monitoring comes from a First Alert L1 WiFi Water Leak and Freeze Detector paired with it.

Features
Automations

YES

Up to 30 First Alert WiFi leak detectors can be paired, and you choose which of them trigger the automatic shutoff in the app's Leak Protection settings.

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