---
product_id: 12031191
title: "Brass & Tubular #9D-M3 1/2 1/2\" Backflow Preventer"
brand: "watts"
price: "$5837"
currency: MXN
in_stock: true
reviews_count: 9
category: "Watts"
url: https://www.desertcart.mx/products/12031191-brass-and-tubular-9d-m3-1-2-1-2-backflow
store_origin: MX
region: Mexico
---

# prevents backflow under pressure suitable for hot & cold water 1/2 inch precision fit Brass & Tubular #9D-M3 1/2 1/2" Backflow Preventer

**Brand:** watts
**Price:** $5837
**Availability:** ✅ In Stock

## Summary

> 🚰 Keep your flow flawless and your water pure—because second best isn’t an option.

## Quick Answers

- **What is this?** Brass & Tubular #9D-M3 1/2 1/2" Backflow Preventer by watts
- **How much does it cost?** $5837 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.mx](https://www.desertcart.mx/products/12031191-brass-and-tubular-9d-m3-1-2-1-2-backflow)

## 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

- • **Durable Brass Body:** Engineered for longevity and corrosion resistance in demanding environments.
- • **Continuous Pressure Ready:** Built to perform flawlessly under constant hot or cold water pressure without fail.
- • **Reliable Rubber Disc Valve:** Ensures airtight sealing to prevent any backflow contamination.
- • **Versatile Application Range:** Perfect for labs, dairy, sterilizers, and boiler feed lines—your all-in-one safety solution.
- • **Compact 1/2" Union FNPT Design:** Seamlessly integrates with smaller supply lines for sleek, professional setups.

## Overview

The Watts Brass & Tubular #9D-M3 1/2" Backflow Preventer is a precision-engineered valve designed to protect potable water supplies by preventing backflow. Featuring a durable brass body and a reliable rubber disc check valve, it fits 1/2 inch union FNPT connections and is suitable for continuous use with hot or cold water. Ideal for laboratory equipment, dairy processing, sterilizers, and boiler feed lines, this compact device ensures safety and compliance in critical water systems.

## Description

1/2" Backflow Preventer

Review: Go with the Flow…… - Worked like a charm and is a solid device. Tested it because I live a boring life and have nothing g else to do with my time. Plus. I did not want putrid hot water back flowing into my potable drinking water. Worked like a charm. Pay the premium - its worth it.
Review: Great valve - Easy to install. Did it's job 👍. Ty

## Features

- WATTS 0950053 Check Valve, 1/2 in, Union FNPT x FNPT, Brass Body
- Specially made for smaller supply lines and ideally suited for laboratory equipment, processing tanks, sterilizers, dairy equipment and similar applications.
- It is particularly recommended for boiler feed lines to prevent backflow when supply pressure falls below system pressure.
- Suitable for use on hot or cold water and can be used under continuous pressure.
- It features a primary check valve utilizing a rubber disc seating against a mating rubber part to ensure tight closing.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000KLHK16 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #53,291 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #79 in Check Valves |
| Brand | Watts |
| Color | Stainless Steel,Brass |
| Connector Type | Union |
| Customer Reviews | 4.4 4.4 out of 5 stars (164) |
| Date First Available | August 17, 2005 |
| Exterior Finish | Brass |
| Included Components | 1/2" Backflow Preventer |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 1.15 pounds |
| Item dimensions L x W x H | 4 x 3 x 2 inches |
| Item model number | 9D-M3 1/2 |
| Manufacturer | Watts Brass & Tubular |
| Material | Brass |
| Measurement System | inch |
| Number of Pieces | 1 |
| Part Number | 9D-M3-1/2 |
| Product Dimensions | 4 x 3 x 2 inches |
| Shape | tubular |
| Size | 1/2 inch |
| Thread Type | NPT |
| UPC | 098268676815 |

## Product Details

- **Brand:** Watts
- **Color:** Stainless Steel,Brass
- **Connector Type:** Union
- **Exterior Finish:** Brass
- **Item Weight:** 1.2 Pounds
- **Item dimensions L x W x H:** 4 x 3 x 2 inches
- **Material:** Brass
- **Number of Pieces:** 1
- **Size:** 1/2 inch
- **Thread Type:** NPT

## Images

![Brass & Tubular #9D-M3 1/2 1/2" Backflow Preventer - Image 1](https://m.media-amazon.com/images/I/61cOWTVXLTL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Go with the Flow……
*by R***B on March 21, 2024*

Worked like a charm and is a solid device. Tested it because I live a boring life and have nothing g else to do with my time. Plus. I did not want putrid hot water back flowing into my potable drinking water. Worked like a charm. Pay the premium - its worth it.

### ⭐⭐⭐⭐⭐ Great valve
*by G***I on November 9, 2023*

Easy to install. Did it's job 👍. Ty

### ⭐⭐⭐⭐⭐ Good value
*by E***D on April 11, 2019*

The BFP was easy to install as I was replacing a defect BFP that was already in place. I only had to disconnect the old valve at the unions, leave the old unions attached to the copper pipes and simply replace the valve body using the new seals. I was quite happy that I was able to get this BFP from Amazon because I had a couple of local supply houses refuse to sell me this valve because I wasn't a plumbing contractor - THEIR LOSS IS AMAZON'S GAIN.

## Frequently Bought Together

- Watts Brass & Tubular #9D-M3 1/2 1/2" Backflow Preventer
- Bell and Gossett 110192 Fb-38 Pressure Reducing Valve
- Hydro Master Automatic Air Vent Valve 1/8 Inch Brass

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*Product available on Desertcart Mexico*
*Store origin: MX*
*Last updated: 2026-03-16*