---
product_id: 18731898
title: "POWERTEC 70145 4-Inch to 3-Inch Reducer"
brand: "powertec"
price: "NT$791"
currency: TWD
in_stock: true
reviews_count: 13
category: "Powertec"
url: https://www.desertcart.tw/products/18731898-powertec-70145-4-inch-to-3-inch-reducer
store_origin: TW
region: Taiwan
---

# 4-inch to 3-inch precise fit Heat resistant up to 176°F (80°C) Heavy-duty ABS plastic durability POWERTEC 70145 4-Inch to 3-Inch Reducer

**Brand:** powertec
**Price:** NT$791
**Availability:** ✅ In Stock

## Summary

> 🔗 Connect with Confidence — Upgrade Your Dust Collection Game!

## Quick Answers

- **What is this?** POWERTEC 70145 4-Inch to 3-Inch Reducer by powertec
- **How much does it cost?** NT$791 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/18731898-powertec-70145-4-inch-to-3-inch-reducer)

## Best For

- powertec enthusiasts

## Why This Product

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

## Key Features

- • **Built to Last:** Crafted from premium ABS plastic to resist abrasion, rust, and corrosion in tough workshop environments.
- • **Quick & Secure Fit:** Tapered port design guarantees a snug, leak-free connection with most 3-inch dust collection hoses.
- • **Heat-Resistant Design:** Safe for use with dryer vents and laser engravers up to 176°F, ensuring versatile application.
- • **Seamless Size Transition:** Effortlessly connect 4-inch hoses to 3-inch lines for optimized dust flow.
- • **Boost Your Dust Collection Efficiency:** Increase air velocity exactly where you need it most, reducing downtime and mess.

## Overview

The POWERTEC 70145 reducer is a precision-engineered dust collection adapter that steps down from a 4-inch outer diameter hose to a 3-inch hose, made from heavy-duty ABS plastic for long-lasting durability and heat resistance up to 176°F. Designed for seamless, secure connections in woodworking, laser engraving, and dryer vent systems, it enhances airflow efficiency and withstands abrasive workshop conditions.

## Description

This dust collection fitting allows you to connect a 3-inch ID opening to 4-inch flexible hose and/or transition a 3-inch ID opening to 4-inch ID standard hose. It’s easy to use and offers a secure, quick attachment to your dust collector hose. It’s ideal for increasing air velocity near the machine where it's needed most. Additionally, it features a tapered port on one side that fits inside most 3" dust collection hose. Heavy Duty Quality We make our reducers utilizing premium ABS plastic material, which provides long-term durability with resistance to rust and corrosion. It’s thick walls are intended to stand up to hose clamp pressure and the abrasive nature of woodworking and workshop dust collection. Specifications Color: Black Material: ABS Plastic 4-Inch Nominal End Measures: 3-15/16-inch outer diameter by 3-45/56-inch inner diameter 3-Inch Nominal End Measures: 2-63/64-inch outer diameter by 2-23/32-inch inner diameter POWERTEC is a leading manufacturer of high quality wood work accessories, sanding discs and an assortment of OEM replacement parts. We are committed to exceeding expectations, while bringing the latest innovations, technology, and product development to the industry.

Review: Perfect fit. - Worked great to fit in the permanent vent hole. Easy to use
Review: Fit perfect - Perfect little expensive

## Features

- INCLUDES: 4-inch to 3-inch dust collection reducer (1pc)
- FUNCTION: This dust collector attachment possesses a 4-inch OD end that connects to standard 4-inch ID dust collection hose and allows you to step down to a 3-inch dust collection hose or line branch. // Note: to connect to other 4” OD ports or adapters, a 4” flex cuff, POWERTEC 70149, will be needed.
- EASY TO USE: Offers a 4” OD profile with tapered port on one side, fits inside most 3” dust collection hose // APPLICATION: Designed for dust collection systems. Also suitable for dryer vents and laser engravers when exhaust temperatures remain within the ABS material’s recommended range (up to 176°F / 80°C).
- PREMIUM QUALITY: Made with heavy duty ABS plastic material for long-term durability and made to withstand the abrasive nature of woodworking and workshop dust collection
- DIMENSIONS: 4-Inch O.D nominal end (measures 3-15/16”) | 3-Inch O.D nominal end (measures 2-31/32”)

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00M3IT378 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #28,551 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #36 in Vacuum & Dust Collector Replacement Parts |
| Brand | POWERTEC |
| Color | 4" to 3" Reducer |
| Connector Type | Reducer |
| Customer Reviews | 4.5 4.5 out of 5 stars (870) |
| Date First Available | October 14, 2011 |
| Exterior Finish | ABS |
| Global Trade Identification Number | 00736815005960 |
| Included Components | 4-Inch to 3-Inch Reducer |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 3.36 ounces |
| Item dimensions L x W x H | 4.14 x 4.14 x 3.44 inches |
| Item model number | 70145 |
| Manufacturer | Southern Technology LLC |
| Material | ABS plastic |
| Number of Pieces | 1 |
| Part Number | 70145 |
| Product Dimensions | 4.14 x 4.14 x 3.44 inches |
| Size | 1 Count (Pack of 1) |
| Style | 4" to 3" Reducer |
| Thread Size | 3 inches |
| UPC | 736815005960 |

## Product Details

- **Brand:** POWERTEC
- **Color:** 4" to 3" Reducer
- **Connector Type:** Reducer
- **Exterior Finish:** ABS
- **Item Weight:** 0.21 Pounds
- **Item dimensions L x W x H:** 4.14 x 4.14 x 3.44 inches
- **Material:** ABS plastic
- **Number of Pieces:** 1
- **Size:** 1 Count (Pack of 1)
- **Thread Size:** 3 inches

## Images

![POWERTEC 70145 4-Inch to 3-Inch Reducer - Image 1](https://m.media-amazon.com/images/I/51bbjT1EtkS.jpg)
![POWERTEC 70145 4-Inch to 3-Inch Reducer - Image 2](https://m.media-amazon.com/images/I/41zEYb3yAqS.jpg)
![POWERTEC 70145 4-Inch to 3-Inch Reducer - Image 3](https://m.media-amazon.com/images/I/41iXZ-YmcjS.jpg)
![POWERTEC 70145 4-Inch to 3-Inch Reducer - Image 4](https://m.media-amazon.com/images/I/61hnLXivRMS.jpg)
![POWERTEC 70145 4-Inch to 3-Inch Reducer - Image 5](https://m.media-amazon.com/images/I/61gYZ7L-3CS.jpg)

## Available Options

This product comes in different **Color** options.

## Questions & Answers

**Q: What is the ID of the 3inch side?**
A: I bought this for my grizzly shaper with a 3" dust port. the 3" end is the same OD as the shaper. What I had to buy was a 3" x 6" piece of dust collector hose. I think Rockler sells it. Good luck.

**Q: I need a 2.75 Outer diameter to 4”.. will this fitting work?**
A: Read the specs carefully.  It is designed to  connect 4" to 3" dia hose.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect fit.
*by C***L on December 17, 2025*

Worked great to fit in the permanent vent hole. Easy to use

### ⭐⭐⭐⭐⭐ Fit perfect
*by B***L on October 13, 2025*

Perfect little expensive

### ⭐⭐⭐⭐⭐ Great accessory for the Diesel Heaters
*by M***N on February 11, 2025*

Got a diesel heater with 3" output and balking at the price of 3" vent extensions? 4" is the universal cheap clothes dryer output and vent extensions of any length are available dirt cheap in that size. So what do you do. You get one of those guys for couple of bucks and free yourself to use that ubiquitous ducting. Sure, it would be nice if they used 4" off the hop, but when the design was stolen all those years ago, it must have used a 3" output, so the chinese clones use a 3" output today. This won't flow more air, nor will it restrict, but it will open up a myriad of cheaper options for routing heat. Does that job perfectly and I will get one for each heater.

## Frequently Bought Together

- POWERTEC 70145 4-Inch to 3-Inch Reducer
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*Product available on Desertcart Taiwan*
*Store origin: TW*
*Last updated: 2026-03-15*