---
product_id: 55544533
title: "Honeywell Automatic Bypass and Differential Pressure Valve"
brand: "honeywell"
price: "RM716"
currency: MYR
in_stock: true
reviews_count: 3
url: https://www.desertcart.com.my/products/55544533-honeywell-automatic-bypass-and-differential-pressure-valve
store_origin: MY
region: Malaysia
---

# 0.1-0.6 bar differential range 22mm compression fittings 50L/min high flow rate Honeywell Automatic Bypass and Differential Pressure Valve

**Brand:** honeywell
**Price:** RM716
**Availability:** ✅ In Stock

## Summary

> 🔥 Keep your boiler running smart and smooth with Honeywell’s precision bypass valve!

## Quick Answers

- **What is this?** Honeywell Automatic Bypass and Differential Pressure Valve by honeywell
- **How much does it cost?** RM716 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.my](https://www.desertcart.com.my/products/55544533-honeywell-automatic-bypass-and-differential-pressure-valve)

## Best For

- honeywell enthusiasts

## Why This Product

- Trusted honeywell brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Seamless Installation:** Standard 22mm compression fittings for hassle-free setup
- • **Robust High-Flow Capacity:** Handles up to 50 liters per minute for optimal boiler performance
- • **Maximized System Efficiency:** Automatically regulates bypass flow to save energy
- • **Effortless Precision Adjustment:** Unique, simple mechanism for quick, reliable tuning
- • **Trusted Compliance & Best Practice:** Recommended by UK government CHeSS guide for central heating

## Overview

The Honeywell DU145 Automatic Bypass and Differential Pressure Valve is a brass, gold-finished valve designed to maintain constant flow through boilers by automatically adjusting bypass flow between 0.1 and 0.6 bar. Featuring a high flow rate of 50 liters per minute and easy 22mm compression fittings, it ensures energy-efficient heating system operation and complies with UK building regulations and best practice guidelines.

## Description

Product Description The DU145 Automatic Bypass Valve controls flow of water through a bypass circuit which is installed between flow and return pipework, typically at or near the boiler. Building Regulation advice states that if a bypass is installed, an Automatic Bypass Valve must be fitted. The DU145 saves energy by only allowing flow through the bypass when needed i.e. when flow through the system is reduced when zone valves or radiator thermostats are closing. The use of an ABV is recommended by the UK government as Best Practice in the CHeSS (Central Heating System Specifications) guide to central heating systems. Box Contains 1 x DU145-3/4B Auto Bypass Valve

Review: Perfect - Excelent 👍 101%👍
Review: Very disappointed - probably going to return - Very disappointed. Firstly it looks very easy for the internal plunger to settle out of alignment and allow permanent leakage/bypass. The biggest problem is that both the adjustment cap and the part with the graduated scale are both free to move independently - turning the adjustment knob also turns the graduated scale so the cap arrow points to 2 all the time. Probably about to return.

## Features

- Unique and simple adjustment mechanism
- High flow-50l per minute
- Wide differential range 0 1-0 6 bar
- 22mm Compression for ease of Install
- Ensures constant flow through boiler

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B006BWJS9K |
| Best Sellers Rank | 419,893 in DIY & Tools ( See Top 100 in DIY & Tools ) 535 in Tap & Valve Washers |
| Brand | Honeywell |
| Customer Reviews | 4.2 out of 5 stars 5 Reviews |
| Exterior Finish | Gold |
| Exterior finish | Gold |
| Global Trade Identification Number | 04019837022778 |
| Included Components | 1 x Honeywell Automatic Bypass and Differential Pressure Valve |
| Inlet Connection Size | 22 Millimeters |
| Inlet Connection Type | Compression |
| Inlet connection size | 22 Millimeters |
| Inlet connection type | Compression |
| Item Dimensions | 7 x 11.5 x 4 centimetres |
| Item Type Name | Automatic Bypass Valve |
| Item dimensions L x W x H | 7 x 11.5 x 4 centimetres |
| Manufacturer | Honeywell |
| Material | Brass |
| Maximum Pressure | 6 Bars |
| Model Number | DU145-3/4B |
| Outlet Connection Type | Compression |
| Unit Count | 1.0 Count |
| Valve Type | automatic bypass,automatic bypass valve |

## Images

![Honeywell Automatic Bypass and Differential Pressure Valve - Image 1](https://m.media-amazon.com/images/I/514A1Pxq0xS.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect
*by K***G on 21 March 2020*

Excelent 👍 101%👍

### ⭐ Very disappointed - probably going to return
*by D***E on 1 June 2016*

Very disappointed. Firstly it looks very easy for the internal plunger to settle out of alignment and allow permanent leakage/bypass. The biggest problem is that both the adjustment cap and the part with the graduated scale are both free to move independently - turning the adjustment knob also turns the graduated scale so the cap arrow points to 2 all the time. Probably about to return.

### ⭐ Poor design
*by A***R on 10 March 2017*

Dial with numbers on should be fixed to the body of the valve and the red knob should rotate around it. In the version I received the two rotated together making it useless. Returned to Amazon and I'm now trying an alternative manufacturer.

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*Product available on Desertcart Malaysia*
*Store origin: MY*
*Last updated: 2026-03-06*