---
product_id: 24321116
title: "Watts - LFMMV-M1-UT - 3/4 Union Inlet Type Thermostatic Mixing Valve,No Lead Copper Silicon Alloy, 13 gpm"
brand: "watts"
price: "VT57921"
currency: VUV
in_stock: true
url: https://www.desertcart.vu/products/24321116-watts-lfmmv-m1-ut-3-4-union-inlet-type-thermostatic
store_origin: VU
region: Vanuatu
---

# Locking temp adjustment 13 GPM flow rate 150 PSI max pressure Watts - LFMMV-M1-UT - 3/4 Union Inlet Type Thermostatic Mixing Valve,No Lead Copper Silicon Alloy, 13 gpm

**Brand:** watts
**Price:** VT57921
**Availability:** ✅ In Stock

## Summary

> 🔥 Mix it right, lock it tight! 🔒

## Quick Answers

- **What is this?** Watts - LFMMV-M1-UT - 3/4 Union Inlet Type Thermostatic Mixing Valve,No Lead Copper Silicon Alloy, 13 gpm by watts
- **How much does it cost?** VT57921 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/24321116-watts-lfmmv-m1-ut-3-4-union-inlet-type-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

- • **Built to Last:** Integral filter washers and check valves protect your system from debris and backflow.
- • **Lock & Secure:** Temperature adjustment cap with locking feature prevents accidental changes—set it and forget it.
- • **Lead-Free Safety:** Crafted from lead-free copper silicon alloy for eco-friendly, health-conscious installations.
- • **Certified Reliability:** Meets ASSE 1070, 1069, 1017 standards for trusted performance in any setting.
- • **Precision Thermal Control:** Solid wax hydraulic thermostat ensures exact temperature mixing every time.

## Overview

The Watts LFMMV-M1-UT is a 3/4" lead-free thermostatic mixing valve designed for residential and commercial use, delivering up to 13 gallons per minute of precisely tempered water. Featuring a durable copper silicon alloy body, a solid wax hydraulic thermostat, and a locking temperature adjustment, it ensures safe, consistent water temperature with a maximum pressure rating of 150 PSI. Certified to ASSE standards, it combines reliability, safety, and ease of use in one compact valve.

## Description

This 3/4" lead free thermostatic mixing valve is designed for residential, commercial or institutional environments for supplying baths or lavatories with tempered water. The double throttling design controls both hot and cold water supply to the mixed outlet. It consists of a lead free brass body, threaded union connections, solid wax hydraulic principle thermostat, integral filter washers and check valves with a locking mechanism for the temperature setting. The adjustable field range temperature at mixed outlet is 80 to 120 degrees F (27 to 49 degrees C). The maximum pressure rating is 150 PSI (10.3 BAR). Watts 0559119 Features: Lead free brass construction Thermal actuation technology for precise temperature control Locking mechanism secures temperature setting ASSE 1070, ASSE 1069, ASSE 1017 and UPC listed

## Features

- Thermostat controls both hot and cold water
- Adjustment cap with locking feature
- Integral filter washers and check valves
- Asse Listed 1070,1069, 1017

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Material | Lead Free Copper Silicon Alloy |
| Brand | Watts |
| Item dimensions L x W x H | 6.3 x 4.5 x 2.6 inches |
| Exterior Finish | Copper |
| Inlet Connection Type | threaded |
| Outlet Connection Type | Threaded |
| Maximum Operating Pressure | 150 Pound per Square Inch |
| Number of Ports | 1 |
| Outlet Connection Size | 4.5 Inches |
| Manufacturer | WATTS |
| UPC | 098268451825 |
| Part Number | LFMMVM1-UT |
| Item Weight | 2.23 pounds |
| Product Dimensions | 6.3 x 4.5 x 2.6 inches |
| Item model number | LFMMV-M1-UT |
| Is Discontinued By Manufacturer | No |
| Size | 4.5 inches x 6.3 inches x 2.6 inches |
| Item Package Quantity | 1 |
| Batteries Included? | No |
| Batteries Required? | No |

## Product Details

- **Material:** Lead Free Copper Silicon Alloy
- **Brand:** Watts
- **Item dimensions L x W x H:** 6.3 x 4.5 x 2.6 inches
- **Exterior Finish:** Copper
- **Inlet Connection Type:** threaded
- **Outlet Connection Type:** Threaded
- **Maximum Operating Pressure:** 150 Pound per Square Inch
- **Number of Ports:** 1
- **Outlet Connection Size:** 4.5 Inches
- **Manufacturer:** WATTS

## Images

![Watts - LFMMV-M1-UT - 3/4 Union Inlet Type Thermostatic Mixing Valve,No Lead Copper Silicon Alloy, 13 gpm - Image 1](https://m.media-amazon.com/images/I/61GVKmOuMGL.jpg)

## Questions & Answers

**Q: What is the min./max. Pressure for both inlets? And is there a drop in outlet pressure?**
A: 30-150 psi operating pressure. Negligible pressure drop.

**Q: What is the min./max. hot water temp. inlet? and how it will work if the hot temp. drop below the min.?**
A: Min/Max HW inlet temp= 120 to 180 degrees.  If the HW inlet water temp is below 120 the valve will simply pass cold water. The max pressure for both inlets is 150 PSI.  There is no listed minimum pressure.
Pressure drop varies with flow- at 6 GPM flow the pressure drop is 10 PSI.

**Q: My solar hot water will be feeding my electric tankless heater. This should drop the water from 180 to 120 degree before tankless heater right?**
A: Yes- but a couple of cautions. The maximum outlet temperature setting is 120 degrees, and the maximum inlet hot water temp to get that 120 degrees is 180 degrees.  The valve is rated to still function at 200 degree inlet temp but at anything over 180 you will likely end up with an outlet temp over 120.

**Q: The temperature adjustment knob will not turn.  Is there a lock or trick to this?**
A: To adjust the setting of the valve, loosen locking
cap screw with hex wrench, see Figure 3. Cap
must be lifted 1/4" to adjust temperature. To
increase the temperature, turn counterclockwise.
To decrease temperature turn clockwise.
4. Lower handle and tighten screw.

## Frequently Bought Together

- Watts - LFMMV-M1-UT - 3/4 Union Inlet Type Thermostatic Mixing Valve,No Lead Copper Silicon Alloy, 13 gpm
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**Shop now:** [https://www.desertcart.vu/products/24321116-watts-lfmmv-m1-ut-3-4-union-inlet-type-thermostatic](https://www.desertcart.vu/products/24321116-watts-lfmmv-m1-ut-3-4-union-inlet-type-thermostatic)

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-03-21*