---
product_id: 522069051
title: "WATTS 1/2 inch B911-M3 Threaded Combination Water Feeder and backflow Preventer by Watts"
brand: "watts"
price: "2282.65 DT"
currency: TND
in_stock: true
category: "Watts"
url: https://www.desertcart.tn/products/522069051-watts-1-2-inch-b911-m3-threaded-combination-water-feeder
store_origin: TN
region: Tunisia
---

# High capacity fill valve 1/2 inch threaded connections Bronze durable body WATTS 1/2 inch B911-M3 Threaded Combination Water Feeder and backflow Preventer by Watts

**Brand:** watts
**Price:** 2282.65 DT
**Availability:** ✅ In Stock

## Summary

> 🔥 Upgrade your boiler feed with Watts’ powerhouse combo! 🛠️

## Quick Answers

- **What is this?** WATTS 1/2 inch B911-M3 Threaded Combination Water Feeder and backflow Preventer by Watts by watts
- **How much does it cost?** 2282.65 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/522069051-watts-1-2-inch-b911-m3-threaded-combination-water-feeder)

## 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 Bronze Body:** Engineered for longevity and corrosion resistance, ensuring your system stays leak-free and reliable.
- • **Rapid System Fill & Purge:** High capacity fill valve accelerates boiler filling, saving you time and hassle on maintenance.
- • **Trusted Industry Standard:** Meets ASSE 1012 certification and supports up to 100 psi (6.9 bar) for robust performance.
- • **Dual Protection in One Unit:** Combines backflow prevention and pressure regulation to safeguard your system effortlessly.
- • **Seamless Threaded Integration:** Standard 1/2 inch NPT threaded connections for easy, secure installation in any hydronic heating setup.

## Overview

The Watts B911-M3 is a premium bronze combination water feeder and backflow preventer designed for commercial and residential hydronic heating systems. Featuring a high capacity fill valve and 1/2 inch threaded connections, it ensures quick system filling and reliable backflow protection up to 100 psi. Certified to ASSE 1012 standards, this compact unit integrates pressure regulation and backflow prevention in one durable, easy-to-install package.

## Description

Series B911, B911S Bronze Combination Fill Valve and Backflow Preventers are for use in commercial and residential hydronic heating systems to provide make-up water to the boiler, and prevent backflow when supply pressure falls below system pressure. It consists of a bronze Watts Model 9D backflow preventer and a bronze Watts Model 1156F feed water pressure regulator in one pre-embled unit. Model B911 has union NPT x NPT connections. Model B911S has union solder x NPT connections. The Series B911, B911S has a high capacity fill valve that provides quick system filling and purging. It is designed for use in the boiler feed lines of hydronic heating systems. Maximum Pressure: 100psi (6.9 bar).

## Features

- Bronze Body
- Easy Service Accessibility
- High Capacity Fill Valve
- International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00093DU5K |
| Brand | Watts |
| Customer Reviews | 4.7 4.7 out of 5 stars (92) |
| Exterior Finish | Bronze |
| Inlet Connection Size | 0.5 Inches |
| Inlet Connection Type | threaded |
| Item Dimensions | 21.6 x 5.1 x 13.3 centimetres |
| Manufacturer | WATTS |
| Material | Bronze |
| Maximum Pressure | 6.9 Bars |
| Model Number | B911T-M3 |
| Number of Ports | 3 |
| Outlet Connection Size | 0.5 Inches |
| Outlet Connection Type | Threaded |
| Part Number | 386463 |
| Specification Met | ASSE 1012 |
| Thread Size | 1/2 inch |
| UPC | 098268918533 |
| Unit Count | 1.0 count |

## Product Details

- **Brand:** Watts
- **Exterior finish:** Bronze
- **Inlet connection size:** 0.5 Inches
- **Inlet connection type:** threaded
- **Item dimensions L x W x H:** 21.6 x 5.1 x 13.3 centimetres
- **Material:** Bronze
- **Maximum operating pressure:** 6.9 Bars
- **Number of ports:** 3
- **Outlet connection size:** 0.5 Inches
- **Outlet connection type:** Threaded

## Images

![WATTS 1/2 inch B911-M3 Threaded Combination Water Feeder and backflow Preventer by Watts - Image 1](https://m.media-amazon.com/images/I/51UOa8NJqnL.jpg)

## Frequently Bought Together

- WATTS 1/2 inch B911-M3 threaded combination water feeder and backflow preventer
- Taco 400-4 1/8-Inch-NPT Float Air Hy-Vent
- Watts 0342691 30 PSI Pressure Relief Valve, Bronze, 3/4" 335 M2-030

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**Shop now:** [https://www.desertcart.tn/products/522069051-watts-1-2-inch-b911-m3-threaded-combination-water-feeder](https://www.desertcart.tn/products/522069051-watts-1-2-inch-b911-m3-threaded-combination-water-feeder)

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-07-05*