---
product_id: 162227048
title: "WATTS 1/2 inch B911-M3 threaded combination water feeder and backflow preventer"
brand: "watts"
price: "18379 kr"
currency: ISK
in_stock: false
reviews_count: 13
url: https://www.desertcart.is/products/162227048-watts-1-2-inch-b911-m3-threaded-combination-water-feeder
store_origin: IS
region: Iceland
---

# 1/2 inch threaded connections High capacity fill valve Pre-assembled for quick install WATTS 1/2 inch B911-M3 threaded combination water feeder and backflow preventer

**Brand:** watts
**Price:** 18379 kr
**Availability:** ❌ Out of Stock

## Summary

> 🚿 Upgrade your plumbing game with Watts’ all-in-one powerhouse!

## Quick Answers

- **What is this?** WATTS 1/2 inch B911-M3 threaded combination water feeder and backflow preventer by watts
- **How much does it cost?** 18379 kr with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/162227048-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

- • **Trusted Performance:** Highly rated with 4.7 stars and proven in hot water boiler systems
- • **Durable Bronze Build:** Robust corrosion-resistant bronze body for lasting reliability
- • **Service-Friendly Design:** Easy access for maintenance keeps downtime minimal
- • **Dual Function Efficiency:** Combines backflow prevention and pressure regulation seamlessly
- • **Streamlined Installation:** Pre-assembled combo unit saves you time and hassle

## Overview

The WATTS 1/2 inch B911-M3 is a pre-assembled combination water feeder and backflow preventer featuring a durable bronze body, threaded 1/2 inch inlet/outlet connections, and a high capacity fill valve. Designed for easy installation and maintenance, it integrates a Model 9D backflow preventer and Model 1156F pressure regulator in one compact unit, ensuring reliable water pressure control and backflow protection for residential or commercial hot water systems.

## Description

Consists of a Model 9D backflow preventer and Model 1156F feed water pressure regulator in one pre-assembled unit

Review: Great replacement piece. - Works as it should.
Review: Plumbing Supplies - This dual service water pressure and back flow valve is exceptional. The installation is super easy, it took me less than 30 mins to add to my hot water boiler. Highly recommend it, and the cost is better than most plumbing suppply warehouses.

## Features

- 1/2 inch B911-M3 Watts threaded combination water feeder and backflow preventer
- Bronze Body
- Pre-Assembled
- Easy Service Accessibility
- High Capacity Fill Valve

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00093DU5K |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #192,818 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #5,849 in Pipe Fittings |
| Brand | Watts |
| Customer Reviews | 4.7 4.7 out of 5 stars (88) |
| Date First Available | April 28, 2005 |
| Exterior Finish | Bronze |
| Inlet Connection Size | 0.5 Inches |
| Inlet Connection Type | threaded |
| Item Package Quantity | 1 |
| Item Weight | 2.51 pounds |
| Item dimensions L x W x H | 8.5 x 2 x 5.25 inches |
| Item model number | B911T-M3 |
| Manufacturer | WATTS |
| Material | Bronze |
| Measurement System | inch |
| Number of Ports | 3 |
| Outlet Connection Size | 0.5 Inches |
| Outlet Connection Type | Threaded |
| Part Number | 386463 |
| Product Dimensions | 8.5 x 2 x 5.25 inches |
| Specification Met | ASSE 1012 |
| UPC | 098268918533 |

## Product Details

- **Brand:** Watts
- **Exterior Finish:** Bronze
- **Inlet Connection Size:** 0.5 Inches
- **Inlet Connection Type:** threaded
- **Item dimensions L x W x H:** 8.5 x 2 x 5.25 inches
- **Material:** Bronze
- **Number of Ports:** 3
- **Outlet Connection Size:** 0.5 Inches
- **Outlet Connection Type:** Threaded
- **Specification Met:** ASSE 1012

## Images

![WATTS 1/2 inch B911-M3 threaded combination water feeder and backflow preventer - Image 1](https://m.media-amazon.com/images/I/319sNBAqCKL.jpg)
![WATTS 1/2 inch B911-M3 threaded combination water feeder and backflow preventer - Image 2](https://m.media-amazon.com/images/I/51UOa8NJqnL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great replacement piece.
*by P***K on September 6, 2025*

Works as it should.

### ⭐⭐⭐⭐⭐ Plumbing Supplies
*by D***I on January 26, 2025*

This dual service water pressure and back flow valve is exceptional. The installation is super easy, it took me less than 30 mins to add to my hot water boiler. Highly recommend it, and the cost is better than most plumbing suppply warehouses.

### ⭐⭐⭐⭐⭐ Works as should.
*by F***D on October 15, 2025*

Works as should. Just beware. They come in 1/2 right up to 1 inch.

## 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

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.is/products/162227048-watts-1-2-inch-b911-m3-threaded-combination-water-feeder](https://www.desertcart.is/products/162227048-watts-1-2-inch-b911-m3-threaded-combination-water-feeder)

---

*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-02-02*