The First Ever Diagnosable & In-Line Repairable Point-of-Use Mixing Valve

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Identify Cross Flow Instantly

Diagnose cross flow at a glance with the industry's first built-in diagnostics indicator that saves time and reduces labor by eliminating time consuming manual testing.
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Make In-Line Repairs

Restore performance quickly with the only in-line repairable point-of-use mixing valve. Just replace the strainer cartridge – no cutting pipes, replacing valves, or shutting down multiple fixtures required.  
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Sustainable by Design

Decrease material waste and save on maintenance over the lifetime of the valve with repeatable, predictable repairs.
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WHITE PAPER

The Real Cost of Cross Flow

Cross flow issues are easy to miss—but costly when they spread. Get a clear breakdown of how cross flow develops in commercial plumbing systems, why traditional point‑of‑use valves make diagnosis challenging, and what teams can do to identify and resolve issues more efficiently. Gain practical insights to improve safety, reduce troubleshooting time, and prevent unnecessary replacements.


See It. Fix It.

Easily diagnose cross flow and repair fouled mixing valves with the industry’s first visual diagnostic indicator and replaceable strainer cartridge


Color-changing indicators at inlet points signal cross flow events
Lead-free DZR Brass body construction
Replaceable 40-mesh stainless steel strainer cartridge
Included cold water outlet cap for three-port application



Buy American Act (BAA) Compliant

The Under Sink Guardian® with Cross Sense™ Indicator is assembled in our Franklin, NH foundry, designed to meet requirements of BAA projects and support domestic manufacturing.


5 Ways the Under Sink Guardian® Slashes Maintenance Time

Diagnose Cross Flow in Seconds — Not Hours

The Cross Sense™ visual indicator eliminates guesswork by showing technicians exactly which valve is failing at a glance, reducing fixture-by-fixture testing and shortening diagnostic time from hours to seconds.

No Cutting Pipe for Repairs

Inline repairability lets technicians swap the strainer cartridge and restore performance without cutting pipe, draining lines, or shutting down entire fixture banks—saving time, labor, and disruption.

Reduce Repeat Service Calls

By pinpointing the true source of cross flow issues on the first visit, the LFUSG-CS reduces misdiagnosis and multi-valve failure callbacks, helping teams complete repairs correctly the first time.

Minimize Downtime in High Traffic Areas

Faster diagnostics and simplified in-line repairs keep restrooms, patient rooms, dining facilities, and other high-use spaces operational, preventing costly shutdowns or service interruptions.

Prevent Unnecessary Valve Replacements

With precise identification of the failing valve, teams avoid replacing full banks “just to be safe.” This reduces material costs, minimizes waste, and delivers long-term savings across the system’s lifecycle.


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Identify Cross Flow at a Glance


The Cross Sense™ indicator is the industry’s first ever visual cross diagnostic tool. No more wasting time manually testing every faucet for cross flow. No more replacing entire valve embankments “just to be safe”.


Now, servicing technicians can confidently identify fouled valved and perform easy in-line repairs, minimizing downtime and reducing maintenance cost.

CASE STUDY

Cincinnati Schools Choose Easy Diagnostics & Repairs

Evanston Academy needed a reliable fix for corroded point-of-use valves to maintain performance and avoid scalding.


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Customer Snapshot


Market: Education - Public Schools

Application: Domestic Hot Water System

System Type: Thermostatic Mixing Valve

Challenge: Corroded point-of-use valves with consistent cross flow

The Challenge

Cincinnati Public Schools faced persistent issues with corroded point-of-use mixing valves, which are required by Ohio plumbing code to prevent student exposure to 140°F water. Across the district’s 66 buildings—each containing 30–50 faucets and totaling more than 3,000 fixtures—the existing valves were failing frequently and could not be cleaned or rebuilt.

The Solution

Cincinnati Public Schools turned to the LFUSG-CS, an advanced thermostatic mixing valve designed specifically for serviceability and field repair. Plumbers removed the old valves and installed the new system, completing each replacement in just 5–7 minutes thanks to simplified connections and braided supply lines.

The Results

Improved maintenance efficiency across 66 school facilities with faster diagnosis and easier service
Significant reduction in long-term costs thanks to repairable components
Enhanced water safety at all locations through reliable, maintainable mixing-valve performance
Faster troubleshooting enabled by immediate visual feedback

Download the Full Case Study

Improve Point‑of‑Use Performance

Cross flow challenges don’t have to slow your team down. Talk with a specialist and discover a smarter approach to point‑of‑use performance.


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