iSpring LS43 Leak Detector with Automatic Shut-Off Valve

The iSpring LS43 water leak detector system combines two sensors with an automatic shut-off valve for whole-house water-line monitoring. Its controller supports up to eight sensors, while installation requires fitting a valve to the water pipe and access to a power outlet.

At a glance

Automatically shuts off the water supply when a sensor detects possible leakage, according to the listing.
The controller supports up to eight water detection sensors, with two included.
A sound and light alarm and controller indicators are described for alerts.
The listing specifies a 3/4-inch NPT automatic shut-off ball valve.

Price

$120.99Save 19%

Reference price: ~~$149.99~~

Price checked: Nov 14, 2026

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Often bought together

iSpring ASLS43 Water Leak Detector Alarm System Add-on Detection Sensor | Wired add-on for LS43.

$30.83

Pros and cons

Pros

Automatic valve closure can limit water flow after a sensor detects a possible leak.
Two included sensors provide more than one detection point, and the controller can support additional sensors up to eight total.
Sound and light alerts can warn people nearby while the valve closes.

Cons

Installing the valve involves cutting into the water pipe, and pipe-specific couplers or joining materials may be needed but are not included, according to the installation instructions.

Technical specifications

12 specifications

Identity
Brand	iSpring
Model	LS43

Dimensions and installation
Dimensions listed	4.5"L x 1"W x 3"H
Weight listed	1.1 pounds
Valve connection	¾’’ NPT
Controller module cable	3 feet
Transformer cable	6 feet
Water sensor cable	20 feet

Detection and control
Sensors included	2 sensors
Maximum connected sensors	8 water detection sensors
Alarm	Sound/light alarm
Power supply	5V / 1A Transformer

What to know before buying

The valve must be installed on the water line, and the controller requires a nearby power outlet. Sensor placement near areas likely to contact leaking water affects coverage. The listing describes pipe-cutting work and says couplers or sweat-joint materials may be needed depending on the pipe type, but does not include them in the stated box contents.

Who is it for?

A good fit for

Homeowners seeking a wired leak-detection system that can shut off a water line automatically.
Buyers who want to monitor multiple leak-prone locations using two included sensors and the option to connect more.

Less suited to

Renters or buyers who cannot modify the water pipe or provide a nearby power outlet.
Anyone seeking a portable, battery-powered, or wireless leak alarm. The listing describes a transformer-powered controller and wired sensor cables.

iSpring LS43 Leak Detector with Automatic Shut-Off Valve · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.6 / 5 · 69 ratings

5 stars84%84%
4 stars5%5%
3 stars4%4%
2 stars2%2%
1 star5%5%

Customer feedback describes the system as reliable and effective for whole-home leak protection, including a report of the main water supply cutting off when a leak was detected. Buyers also comment positively on quality and value. For a home where an automatic response matters, those impressions relate to the listed shut-off valve and multi-sensor controller, but they do not establish performance in every installation.

Positive themes

Customer feedback highlights perceived reliability and quality.
Customers describe the system positively for leak protection and value.

Frequently asked questions

Does the LS43 shut off water automatically?

The listing says the valve automatically shuts off the water supply when a sensor detects a possible leak.

How many sensors are included, and how many can connect?

Two sensors are listed as included. The controller is described as supporting up to eight sensors.

What should I know about installation?

The valve is installed on the water pipe and the instructions describe cutting the pipe. The controller needs a power outlet. Depending on the pipe type, couplers or sweat-joint materials may be needed and are not included.

Does it provide an audible alert?

The listing describes a sound and light alarm and says the controller has indicators that identify which sensor detected water.