---
product_id: 14910665
title: "Watts USG-B-M2 3/8\" Under Sink Guardian Thermostatic Mixing Valve (0204141)"
brand: "watts"
price: "S$155"
currency: SGD
in_stock: true
reviews_count: 8
category: "Watts"
url: https://www.desertcart.sg/products/14910665-watts-usg-b-m2-3-8-under-sink-guardian-thermostatic
store_origin: SG
region: Singapore
---

# Built-in check valves stop water cross-migration Tamper-resistant locking nut prevents misadjustments Lead-free brass body for durability Watts USG-B-M2 3/8" Under Sink Guardian Thermostatic Mixing Valve (0204141)

**Brand:** watts
**Price:** S$155
**Availability:** ✅ In Stock

## Summary

> 🔥 Stay cool, stay safe — the ultimate under-sink guardian! 💧

## Quick Answers

- **What is this?** Watts USG-B-M2 3/8" Under Sink Guardian Thermostatic Mixing Valve (0204141) by watts
- **How much does it cost?** S$155 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/14910665-watts-usg-b-m2-3-8-under-sink-guardian-thermostatic)

## Best For

- watts enthusiasts

## Why This Product

- Trusted watts brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Safety-First Design:** Tamper-resistant locking nut and built-in check valves guarantee safe, reliable operation
- • **Versatile Application:** Ideal for under-sink use in homes, salons, daycares, and eldercare facilities to protect vulnerable users
- • **Effortless Installation:** Compact 3/8" compression fittings make setup quick and hassle-free, even for first-timers
- • **Precision Temperature Control:** Ensures consistent water temperature to prevent scalding and discomfort
- • **Robust Lead-Free Brass Construction:** Durable, corrosion-resistant bronze body built to last in commercial and residential settings

## Overview

The Watts USG-B-M2 3/8" Under Sink Guardian Thermostatic Mixing Valve is a lead-free brass valve designed to mix hot and cold water safely and consistently. Featuring tamper-resistant locking nuts and built-in check valves, it prevents accidental temperature changes and water cross-flow. Compact and easy to install, it’s perfect for commercial and residential use, providing peace of mind in environments like salons, daycares, and homes with children or elderly residents.

## Description

Series USG-B Under Sink Guardian Thermostatic Mixing Valves are used in commercial and residential applications to mix hot and cold water in under-the-sink installations to minimize the risk of accidental scalding. It consists of a bronze body constructio

Review: Perfect for the shampoo bowl - I’m a hair dresser and I have my own studio and I installed this under the shampoo bowl. Before I got this,, I was constantly struggling with keeping the water at a consistent temperature. It was either too hot, then too cold and then back to hot and when I comes to rinsing color or other chemicals out, I need to do it quick. This was a game changer. Once the water gets to the temperature it needs to be, it stays at that temperature. It was so easy to install. It does what it says it does. Nothing ever is that easy in my experience. Whenever I try something new ,, I usually always do it wrong and then have to redo it until I get it right. But this I got right, works great,,I couldn’t be happier
Review: Perfect for controlling hot water temps. - Great product built with good quality. Works as it says, great for the use in bathrooms with children or elderly.. I personally use these in both bathrooms as a run a daycare piece of mind, knowing that the water will not burn anyone’s hand. Easy to install.

## Features

- Lead Free Brass body construction
- Includes tamper resistant locking nut to prevent accidental misadjustments, Built in check valves prevent migration of hot water to cold and cold water to hot water piping, Provided with cap for three port application

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00AN89GKO |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #38,097 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #30 in Faucet Valves |
| Brand | Watts |
| Customer Reviews | 4.7 4.7 out of 5 stars (130) |
| Date First Available | June 15, 2012 |
| Exterior Finish | Bronze |
| Global Trade Identification Number | 00098268548471 |
| Inlet Connection Type | Compression |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 12.3 ounces |
| Item model number | USG-B-M2 |
| Manufacturer | Watts |
| Material | Brass, Bronze |
| Number of Ports | 4 |
| Outlet Connection Size | 0.38 Inches |
| Outlet Connection Type | Compression |
| Package Dimensions | 3.82 x 3.54 x 2.52 inches |
| Part Number | USG-B-M2 3/8" |
| Size | 3/8 Inch |
| Specification Met | ASSE 1070 |
| UPC | 098268548471 |

## Product Details

- **Brand:** Watts
- **Exterior Finish:** Bronze
- **Global Trade Identification Number:** 00098268548471
- **Inlet Connection Type:** Compression
- **Manufacturer:** Watts
- **Material:** Brass, Bronze
- **Number of Ports:** 4
- **Outlet Connection Size:** 0.38 Inches
- **Outlet Connection Type:** Compression
- **Specification Met:** ASSE 1070

## Images

![Watts USG-B-M2 3/8" Under Sink Guardian Thermostatic Mixing Valve (0204141) - Image 1](https://m.media-amazon.com/images/I/61e07W5s+eL.jpg)

## Questions & Answers

**Q: is this product lead free**
A: Yes

**Q: Does this valve has total flow shut-off if cold supply fails? similar to the cash acme thermostatic valves.**
A: Yes it is an ASSE 1070 valve- to get that rating a valve has to provide that protection.

**Q: is the kohler  k 99799 na  the same mixing valve as watts usg b m2 3/8 mixing valve/?**
A: Looking at them they seem the same. Hot and cold supply with mixing of the two to have a controlled warm water for your hot faucet and maintain a cold 
Pass through for the cold faucet.

**Q: Can you asjust the temperature?**
A: Yes.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect for the shampoo bowl
*by S***H on March 22, 2025*

I’m a hair dresser and I have my own studio and I installed this under the shampoo bowl. Before I got this,, I was constantly struggling with keeping the water at a consistent temperature. It was either too hot, then too cold and then back to hot and when I comes to rinsing color or other chemicals out, I need to do it quick. This was a game changer. Once the water gets to the temperature it needs to be, it stays at that temperature. It was so easy to install. It does what it says it does. Nothing ever is that easy in my experience. Whenever I try something new ,, I usually always do it wrong and then have to redo it until I get it right. But this I got right, works great,,I couldn’t be happier

### ⭐⭐⭐⭐⭐ Perfect for controlling hot water temps.
*by J***N on April 9, 2025*

Great product built with good quality. Works as it says, great for the use in bathrooms with children or elderly.. I personally use these in both bathrooms as a run a daycare piece of mind, knowing that the water will not burn anyone’s hand. Easy to install.

### ⭐⭐⭐⭐⭐ Works great to limit hot water temp at the faucet
*by S***N on February 27, 2020*

I have two small children in the house, but still wanted to keep my hot water temp warm enough to kill legionella, and be effective for the dishwasher / clothes washer. I found these valves, and ordered 1 for each sink in the home. Each installed fairly easily (if you can install a new faucet, you can install these, no need to be a plumber, but you need to have some "wrench" skills). After install, I can turn the faucet to full hot, and the hot water never exceeds what the valve is set to. This allowed me to crank the hot water heater up to 150 degrees, and still be sure even if a kid turns on only the hot, he isn't going to get burned. I tested each valve after install, by cutting off the flow of cold water to the valve, and confirmed that the valve would stop water flow from the hot side to a very tiny trickle, maintaining the temperature (or stopping the flow if it can't). While they are expensive, it was cheaper than one visit to to the ER because someone was scalded. My only wish was that they were a little more affordable, but hoping that "you get what you pay for" and I won't have any problems out of them.

## Frequently Bought Together

- Watts USG-B-M2 3/8" Under Sink Guardian Thermostatic Mixing Valve (0204141)
- Faucet Supply Lines 3/8" to 3/8" Female Compression Thread 1 Pair, ARCORA 9“ Faucet Hose Connects Kitchen Bathroom Sink to Water Supply

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-03-12*