---
product_id: 4256945
title: "Mueller/B & K 108-904RP Backflow Preventer-Vacuum Breaker"
brand: "mueller b & k"
price: "S/.114"
currency: PEN
in_stock: true
reviews_count: 8
url: https://www.desertcart.pe/products/4256945-mueller-b-and-k-108-904rp-backflow-preventer-vacuum-breaker
store_origin: PE
region: Peru
---

# Universal 3/4'' hose thread fit Designed for nonfreezing zones Reliable backflow protection Mueller/B & K 108-904RP Backflow Preventer-Vacuum Breaker

**Brand:** mueller b & k
**Price:** S/.114
**Availability:** ✅ In Stock

## Summary

> 🛠️ Keep your water pure, your garden thriving, and your peace of mind intact!

## Quick Answers

- **What is this?** Mueller/B & K 108-904RP Backflow Preventer-Vacuum Breaker by mueller b & k
- **How much does it cost?** S/.114 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pe](https://www.desertcart.pe/products/4256945-mueller-b-and-k-108-904rp-backflow-preventer-vacuum-breaker)

## Best For

- mueller b & k enthusiasts

## Why This Product

- Trusted mueller b & k brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Durable Brass Build:** Crafted from premium brass for long-lasting corrosion resistance
- • **Compact & Lightweight:** Only 0.16 oz and 4x3x3 inches—easy to handle and install anywhere
- • **Freeze-Free Assurance:** Optimized for nonfreezing areas to maintain peak performance year-round
- • **Ultimate Water Safety:** Prevents contamination with trusted backflow prevention technology
- • **Seamless Compatibility:** Fits any standard 3/4'' hose thread outlet for effortless installation

## Overview

The Mueller/B & K 108-904RP Backflow Preventer-Vacuum Breaker is a compact, brass-constructed device designed to prevent water contamination by stopping backflow. It fits any 3/4'' hose thread outlet and is ideal for nonfreezing environments, ensuring reliable irrigation safety and durability.

## Description

Mueller/B & K 108-904RP Backflow Preventer-Vacuum Breaker

## Features

- For nonfreezing areas only
- Fits any 3/4'' hose thread outlet
- Brand Name: Mueller
- Manufacturer: Mueller

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000DZHA7S |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #296,617 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #8,909 in Pipe Fittings |
| Customer Reviews | 4.4 4.4 out of 5 stars (613) |
| Date First Available | January 18, 2007 |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 0.16 ounces |
| Item model number | FBA_108-904RP |
| Manufacturer | Mueller |
| Material | Brass |
| Measurement System | inch |
| Number Of Pieces | 1 |
| Part Number | FBA_108-904RP |
| Product Dimensions | 4 x 3 x 3 inches |
| Size | 3/4 In. MHT x 3/4 In. FHT |

## Images

![Mueller/B & K 108-904RP Backflow Preventer-Vacuum Breaker - Image 1](https://m.media-amazon.com/images/I/710w7FowSZL.jpg)

## Questions & Answers

**Q: Does  the female portion of this item have FINE treads and the male portion to hook the hose to should be normal hose threads ?**
A: Both are standard garden hose threads. (MHT	Male hose thread)(FHT	Female hose thread)

**Q: Can I use this for laundry tubs?**
A: When the water pressure is shut off the excess water in the hose which would normally flow back into the hose instead comes out the small holes around the edge so I would not recommend using this anywhere you would want to stay dry.

**Q: I am looking for fine threads on the house side of the vacuum breaker and the course threads on the hose side. Does this one have that configuration?**
A: Check out:  SpigotMaster ~SM01 Vacuum Breaker Adapter~ Converts an Arrowhead PK1390 Anti-Siphon Valve Into a Straight Through Connection 
https://www.amazon.com/SpigotMaster-Adapter-Arrowhead-Anti-Siphon-Connection/dp/B07BD4H8RP/ref=cm_cr_arp_d_product_top?ie=UTF8

**Q: Does it include rubber washer?**
A: mine shipped with a rubber washer

## Customer Reviews

### ⭐⭐⭐⭐⭐ This really works. I got a cheaper plastic one ...
*by K***G on July 30, 2018*

This really works. I got a cheaper plastic one first that kept leaking. Had no trouble with this one. I didn't even use the white plumbers tape. It makes a soft sound and does spray water when it activates, but at least I know its working. I have a soaker hose system setup for my raised garden beds with a timer. So the hose is on all the time under pressure. This goes off anytime the water is used in the house (sinks, toilet, shower, washing machine) so I know it really works. Just don't set it up somewhere you don't want to get wet.

### ⭐⭐⭐⭐⭐ High build quality
*by K***R on March 31, 2019*

This is a very well built device. It appears to work properly and it was very easy to install. I am not a professional plumber so I can't speak to its performance characteristics, but if I need a backflow preventer again, I will purchase this item.

### ⭐⭐⭐⭐ Makes pipes whine and sprays me in the face but works well.
*by M***E on July 10, 2017*

This is the first backflow preventer I've used, but I do a lot of gardening and have a hose constantly connected to the outdoor spigot so I followed someone's advice and purchased this. I did not know about or expect the strong mist of water that periodically sprays out of the periphery of the valve, and it got me in the face right after I installed it :D. I guess that's just how a backflow preventer works... I assume it's releasing accumulated pressure. I will say that after I installed this, I started hearing a whining sound coming from the pipes in the house every time I flushed the toilet or shut off a running faucet. It took me several days of online research before figuring out that the backflow preventer causes this if the outside spigot is left on by creating a pressure differential between the outside hose and the indoor plumbing. I think it's harmless, but if your pipes start whining every time you use the water in your home, that's probably why.

## Frequently Bought Together

- Mueller FBA_108-904RP 108-904RP Backflow Preventer-Vacuum Breaker
- Homewerks Worldwide VACBFPZ4B Vacuum Breaker Hose Bib Backflow Preventer, 3/4 Inch, Brass
- Rain Bird HT07525PSI Drip Irrigation 25 PSI Pressure Regulator, 3/4" Female Hose Thread x 3/4" Male Hose Thread

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*Product available on Desertcart Peru*
*Store origin: PE*
*Last updated: 2026-03-15*