Ajax WaterStop 3/4" (DN20) Black Wireless Water Shut-Off Valve

Ajax WaterStop 3/4" (DN20) Black Wireless Water Shut-Off Valve

The Ajax WaterStop is a remotely controlled electric water valve that forms the automated response element of an Ajax flood prevention system. Fitted with a high-quality brass shutoff valve and a powerful electric actuator, this 3/4-inch (DN20) black version installs directly into an existing hot or cold water line and closes the supply in seconds whenever a leak is detected, a schedule triggers, or a user issues a manual command from the Ajax app.

Key Features

• Fast automatic shutoff: Closes the water supply in around 5 seconds once a leak alarm or manual command is received.
• Long-range wireless link: Communicates with an Ajax hub over the encrypted Jeweller radio protocol at ranges of up to 1,100 m in open space.
• Powerful actuator: Delivers strong torque so the valve can still shut off even if it has become stiff or partially seized.
• Hot and cold water compatible: Rated for operation on pipes carrying water at elevated temperatures as well as standard cold-water lines.
• Long battery life: Runs on replaceable batteries for up to three years, with an optional external 9V power connection for continuous operation.
• Manual override: Can be opened or closed directly using the button on the actuator or the lever on the valve body, without needing the app.
• Tamper and overheat protection: Reports unauthorised dismantling attempts and includes thermal protection for the electronics.
• Flexible mounting: Multiple mounting positions and a choice of standard or anti-sabotage lockers suit different pipe layouts and public installations.
• Smart automation: Works with Ajax LeaksProtect or third-party leak detectors, and supports scenarios based on schedule, arming state, or other triggers.

Reliable Flood Protection for Homes and Businesses

WaterStop is designed to work as part of a broader Ajax leak-prevention setup, sitting alongside leak detectors to form a self-contained response system. It suits residential properties, offices, retail premises, and light commercial sites where an undetected pipe leak or burst could cause costly water damage. Because it integrates with the Ajax hub and app, property managers and homeowners can check valve status and open or close the supply remotely, and configure automated rules so the water is shut off the moment a leak sensor is triggered, even when no one is on site.

What's in the Box

• Ajax WaterStop electric actuator
• 3/4" (DN20) brass shutoff valve
• Pre-installed batteries
• Standard mounting locker (pre-installed)
• Anti-sabotage mounting locker
• Sealing nut
• Quick start guide

Frequently Asked Questions

Does WaterStop need an Ajax hub to work?
Yes, it communicates with an Ajax security hub over the Jeweller radio protocol and is configured and monitored through the Ajax app.

Can it shut off the water automatically if I'm not home?
Yes, it can respond automatically to an Ajax LeaksProtect alarm or a compatible third-party leak sensor, or follow a schedule you set in the app.

Is this valve suitable for hot water pipes?
Yes, the 3/4" WaterStop is built to handle both hot and cold water supply lines.

Additional Resources

• More info