---
product_id: 15040882
title: "270040 4\" Rubber Test-Ball Pipe Plug"
brand: "cherne"
price: "$159"
currency: NZD
in_stock: true
reviews_count: 8
category: "Cherne"
url: https://www.desertcart.nz/products/15040882-270040-4-rubber-test-ball-pipe-plug
store_origin: NZ
region: New Zealand
---

# Inflatable design for tight seals Chain & ring anchor prevents plug loss 4-inch nominal size 270040 4" Rubber Test-Ball Pipe Plug

**Brand:** cherne
**Price:** $159
**Availability:** ✅ In Stock

## Summary

> 🚀 Plug into precision — test smarter, not harder!

## Quick Answers

- **What is this?** 270040 4" Rubber Test-Ball Pipe Plug by cherne
- **How much does it cost?** $159 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/15040882-270040-4-rubber-test-ball-pipe-plug)

## Best For

- cherne enthusiasts

## Why This Product

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

## Key Features

- • **Inflatable Seal Tech:** Expands to seal out-of-round and hard-to-reach pipes effortlessly.
- • **Precision 4-Inch Fit:** Seamlessly tests standard DWV pipes with exact sizing.
- • **Durable Natural Rubber:** Offers superior expansion memory and long-lasting reliability.
- • **Secure Chain & Ring Anchor:** Prevents accidental plug loss during high-pressure tests.
- • **Pressure-Ready Up to 13 PSI:** Handles rigorous testing pressures without fail.

## Overview

The Cherne 270040 4" Rubber Test-Ball Pipe Plug is a professional-grade inflatable rubber plug designed for testing drain, waste, and vent (DWV) systems. It fits 4-inch nominal pipes, withstands pressures up to 13 PSI, and features a natural rubber body for excellent expansion and memory. Its inflatable design allows insertion through test tees to seal irregular or hard-to-access pipes, while the zinc-plated chain and ring assembly prevent the plug from being lost during testing. Trusted by professionals for reliable, reusable, and efficient pipe testing.

## Description

Product Description Cherne Single-Size Test-Ball® Plugs are expandable rubber test plugs designed to test drain, vent and waste systems in every type of pipe. Utilizing a standard tire air fitting for easy connections, its inflatable design can be inserted through a test tee to seal out-of-round pipe and hard-to-access openings. These plumbing test plugs are available in a variety of nominal sizes to accommodate your DWV testing needs. Cherne Industries is a global leader in pipe plug, blocking and testing. From the Manufacturer Cherne's Single-Size Test-Ball Plugs. Made of natural rubber for excellent expansion and memory. Seals both round and out-of-round pipe. Zinc-plated steel chain and ring handle acts as an anchor to prevent plug from sliding down a line. Fits easily through test tees, sanitary tees, floor drains, and other "tight" situations. Broader expansion range than mechanical plugs.

Review: A life-saver when it comes to killing roots in your sewer!! - This Test Ball saved me, and will likely save me in the future, from expensive roto rooter visits. My sewer connection to the streets is periodically invaded by roots. After the last professional cleanout and cutting out of roots by the ever more expensive roto rooter, I bought this little gem, together with a 3-foot extension tube. Sunk it into a cleanout, threaded it into the sewer line, and thanks to the extension tube was able to inflate this plug and thus block the sewer line. Then dropped root-killing compound through an other, upstream cleanout (a toilet would have worked, too), added enough water to generate foam, and let it sit for 6 hours as per instructions. After that, simply deflated the plug by means of the 3-foot extension and pulled it back out of the cleanout. A few minutes work each, before and after the 6 hour pause. Am planning to repeat this process every 6 months and, hopefully, never need roto rooter again...! The product itself is well made, sturdy, and will likely work for many such uses. One minor caution: There is a chain attached to the plug and a large ring, thoughtfully designed to be large enough that it will prevent the plug from disappearing into the pipe forever. Unfortunately, because I had to sink the plug several feet down a cleanout, the chain was too short and I had to detach the ring and instead tie a sturdy rope to the chain. Not a product defect, just a peculiarity of my application.
Review: Works perfect, made well and easy to use... - I had to do a static water test for inspection on my hunting cabin...this is a quality tool that will last forever and is easy to use. It works best if you install it the end of your main drain for testing but plan on having a lot of water everywhere. Next best is in the side of a Tee clean out {like a 4 inch straight coupler but with the screw on cap on the side} so it can run into the tank or street drain system. Caution, be careful when you release the valve to let the water go!!! Keep your fingers out of the way, there will be a lot of pressure trying to push the test plug thru the pipe...it can injure your hand or fingers if you try to hold it. Best done quickly, let the valve go and pull the test ball right on out of the way then screw in the cap before the water really gets moving or you will get wet. Most things rubber are cheap cheesy junk but this tool is very high quality...buy with confidence!!!

## Features

- Test ball plug 4 in. nominal size
- Tests DWV systems at pressures up to 13 PSI/30 ft.
- Natural rubber body provides excellent expansion
- Inflatable design can be inserted through a test tee to seal out-of-round pipe and hard-to-access openings
- Utilizes a standard tire air fitting for easy connections
- Ring and chain assembly helps prevent the plug from being drawn into DWV systems during tests

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000VYL5AE |
| Batteries required | No |
| Best Sellers Rank | #41,908 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #92 in Biscuits & Plugs |
| Brand | Cherne |
| Color | Black |
| Customer Reviews | 4.5 4.5 out of 5 stars (315) |
| Department | 9207 |
| Global Trade Identification Number | 00675115270046 |
| Included Components | (1) 4 in. Rubber Test Ball Pipe Plug |
| Is Discontinued By Manufacturer | No |
| Item Weight | 11.2 ounces |
| Item model number | 270040 |
| Manufacturer | Cherne |
| Material | Rubber |
| National Stock Number | 4730-01-280-9718 |
| Number of Items | 1 |
| Number of pieces | 1 |
| Product Dimensions | 7.5"W x 6.8"H |
| UPC | 094717297877 784497427273 675115270046 |

## Product Details

- **Brand:** Cherne
- **Color:** Black
- **Item Weight:** 0.7 Pounds
- **Material:** Rubber
- **Product Dimensions:** 7.5"W x 6.8"H

## Images

![270040 4" Rubber Test-Ball Pipe Plug - Image 1](https://m.media-amazon.com/images/I/71iQvf5CxAL.jpg)

## Available Options

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

## Questions & Answers

**Q: I just ordered the 4” ball and hoping it will expand large enough to fill a 5 1/2” pipe. Will this work or do you have a bigger one?**
A: I bought some pills that claimed they could expand my 4" tool to 5.5".  We're both out of luck, buddy.

**Q: how is this product filled with air? can you use a bicycle tire air pump or must it be an aircompresor?**
A: We used a portable air tank, that we filled at the local gas station. The fitting is for a car tube type valve, not sure if a bicycle pump has the same fitting, but if so it should inflate the product. We have such confidence in this that we have purchased another one just as a stand by.

**Q: How big does this inflate to. I have an old size that is 5 terocada pipe. Would this be able to plug that pipe?**
A: 4.25" is max for a 4" plug

**Q: Would this product create an air tight seal?**
A: I filled a 4" sewer line up with water and plugged it with the test ball plug and had no leakage. So it works well for water. There was no pressure in the line, so if you are talking about air pressure and how much, not sure if it was designed for that.

## Customer Reviews

### ⭐⭐⭐⭐⭐ A life-saver when it comes to killing roots in your sewer!!
*by R***S on February 18, 2016*

This Test Ball saved me, and will likely save me in the future, from expensive roto rooter visits. My sewer connection to the streets is periodically invaded by roots. After the last professional cleanout and cutting out of roots by the ever more expensive roto rooter, I bought this little gem, together with a 3-foot extension tube. Sunk it into a cleanout, threaded it into the sewer line, and thanks to the extension tube was able to inflate this plug and thus block the sewer line. Then dropped root-killing compound through an other, upstream cleanout (a toilet would have worked, too), added enough water to generate foam, and let it sit for 6 hours as per instructions. After that, simply deflated the plug by means of the 3-foot extension and pulled it back out of the cleanout. A few minutes work each, before and after the 6 hour pause. Am planning to repeat this process every 6 months and, hopefully, never need roto rooter again...! The product itself is well made, sturdy, and will likely work for many such uses. One minor caution: There is a chain attached to the plug and a large ring, thoughtfully designed to be large enough that it will prevent the plug from disappearing into the pipe forever. Unfortunately, because I had to sink the plug several feet down a cleanout, the chain was too short and I had to detach the ring and instead tie a sturdy rope to the chain. Not a product defect, just a peculiarity of my application.

### ⭐⭐⭐⭐⭐ Works perfect, made well and easy to use...
*by M***C on August 13, 2013*

I had to do a static water test for inspection on my hunting cabin...this is a quality tool that will last forever and is easy to use. It works best if you install it the end of your main drain for testing but plan on having a lot of water everywhere. Next best is in the side of a Tee clean out {like a 4 inch straight coupler but with the screw on cap on the side} so it can run into the tank or street drain system. Caution, be careful when you release the valve to let the water go!!! Keep your fingers out of the way, there will be a lot of pressure trying to push the test plug thru the pipe...it can injure your hand or fingers if you try to hold it. Best done quickly, let the valve go and pull the test ball right on out of the way then screw in the cap before the water really gets moving or you will get wet. Most things rubber are cheap cheesy junk but this tool is very high quality...buy with confidence!!!

### ⭐⭐⭐⭐⭐ No leaks, hold back an enormous amount of water!
*by A***L on September 20, 2020*

Used to block DWV line for water column test. Worked great. Held back entire house DWV volume of water (that’s a lot of water!) for several days while awaiting plumbing inspection. No leaks, no problems. Held 30psi (recommended fill pressure) and stayed tight. The safety chain might need to be made longer for some users to get it into the right position to block a pipe if your access clean out tee is more than about 18” long to the main line. DO NOT remove the chain completely! If you release the pressure on the balloon with water behind it it will likely be sent down the pipe never to be seen again... Side note: invest in the extension hose for the Schrader valve that is sold separately. Definitely worth it, adds length needed to make filling the balloon much easier. (It should just come with it...)

## Frequently Bought Together

- Cherne 270040 Rubber Test Ball Pipe Plug, 4" , Black
- VIAIR 6 ft. Air Extension Hose for Portable Compressors, Black, P/N 00016
- Cherne 270032 Test-Ball 3-Inch Plug , Black

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-03-13*