---
product_id: 281144871
title: "ONDYNew Leak Down r Tu-21 Engine Cylinder Leak r Leakage Detector Engine Compression r Gauges Set"
brand: "ondy"
price: "$151"
currency: NZD
in_stock: true
reviews_count: 5
url: https://www.desertcart.nz/products/281144871-ondynew-leak-down-r-tu-21-engine-cylinder-leak-r
store_origin: NZ
region: New Zealand
---

# Fits 4-stroke gasoline engines Accurate cylinder leak down & compression comparison Compatible with 10-14mm spark plugs ONDYNew Leak Down r Tu-21 Engine Cylinder Leak r Leakage Detector Engine Compression r Gauges Set

**Brand:** ondy
**Price:** $151
**Availability:** ✅ In Stock

## Summary

> 🔍 Diagnose like a pro, drive with confidence!

## Quick Answers

- **What is this?** ONDYNew Leak Down r Tu-21 Engine Cylinder Leak r Leakage Detector Engine Compression r Gauges Set by ondy
- **How much does it cost?** $151 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/281144871-ondynew-leak-down-r-tu-21-engine-cylinder-leak-r)

## Best For

- ondy enthusiasts

## Why This Product

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

## Key Features

- • **Compact & Versatile:** Ideal for trucks and modern cars with tight engine clearances—professional-grade testing in a portable package.
- • **Precision Diagnosis:** Pinpoints engine issues like worn piston rings, valves, cylinder wall damage, and blown head gaskets with clinical accuracy.
- • **User-Friendly Setup:** Quick calibration and straightforward hose connections mean you spend less time prepping and more time diagnosing.
- • **Universal Compatibility:** Works seamlessly with most petrol engines featuring 10, 12, or 14mm spark plugs—no guesswork needed.
- • **Comprehensive Cylinder Comparison:** Easily compare suspect cylinders against healthy ones to isolate problems fast and confidently.

## Overview

The ONDYNew Leak Down r Tu-21 is a precision engine cylinder leak and compression tester designed for gasoline 4-stroke engines with 10-14mm spark plugs. It enables accurate detection of common engine faults by comparing suspect cylinders to healthy ones, featuring easy setup and compatibility with tight engine spaces, making it an essential tool for professional-grade vehicle diagnostics.

## Description

ONDYNew Leak Down r Tu-21 Engine Cylinder Leak r Leakage Detector Engine Compression r Gauges Set

## Features

- FITS YOUR VEHICLE -- It is compatible with gasoline 4-stroke engines and 12mm or 14mm spark. As long your vehicle has a standard spark plug socket, this set will work for you.
- COMPARE CYLINDERS -- It best tests cylinder leak down and compression when comparing a suspect cylinder to a known good cylinder on the same engine.
- EASY TO USE -- Remove the Schrader valve and turn the regulator off before applying shop air. Install the hose to the cylinder, the unit to an air supply, calibrate the leak gauge, and connect the unit to the cylinder hose. Diagnosis is made by observing the amount of leakage indicated on the cylinder leakage gauge and listening for leakage at various points of the car system.
- Designed to detect a variety of common engine faults. including: Worn piston rings, worn valves, s in cylinder walls and blown head gaskets.
- Suitable for use on any petrol engine with 10, 12 or 14mm spark plugs. r checks the amount of leakage in an engine cylinder & helps determine the source. Ideal for testing trucks & late model cars where clearance is minimal.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08225M7VC |
| Best Sellers Rank | #183,174 in Automotive ( See Top 100 in Automotive ) #2,374 in Diagnostic, Test & Measurement Tools |
| Brand | ONDY |
| Date First Available | November 26, 2019 |
| Item Weight | 3.12 pounds |
| Item dimensions L x W x H | 11.81 x 11.81 x 1.97 inches |
| Manufacturer | ONDY |
| Material | Carbon steel |
| Product Dimensions | 11.81 x 11.81 x 1.97 inches |
| Thread Type | Npt |
| UPC | 016071508109 |

## Product Details

- **Brand:** ONDY
- **Item dimensions L x W x H:** 11.81 x 11.81 x 1.97 inches
- **Material:** Carbon steel
- **Thread Type:** Npt
- **UPC:** 016071508109

## Images

![ONDYNew Leak Down r Tu-21 Engine Cylinder Leak r Leakage Detector Engine Compression r Gauges Set - Image 1](https://m.media-amazon.com/images/I/81hp0zGvQsL.jpg)
![ONDYNew Leak Down r Tu-21 Engine Cylinder Leak r Leakage Detector Engine Compression r Gauges Set - Image 2](https://m.media-amazon.com/images/I/81+O9WPDreL.jpg)
![ONDYNew Leak Down r Tu-21 Engine Cylinder Leak r Leakage Detector Engine Compression r Gauges Set - Image 3](https://m.media-amazon.com/images/I/81AZ4cs2FsL.jpg)
![ONDYNew Leak Down r Tu-21 Engine Cylinder Leak r Leakage Detector Engine Compression r Gauges Set - Image 4](https://m.media-amazon.com/images/I/81hB2ImneDL.jpg)
![ONDYNew Leak Down r Tu-21 Engine Cylinder Leak r Leakage Detector Engine Compression r Gauges Set - Image 5](https://m.media-amazon.com/images/I/71uhoqf2ILL.jpg)

## Questions & Answers

**Q: This says for compression and leak test.  compression testing requires a gauge to at least 180 psi but gauge shown is far less. is picture wrong?**
A: I would not use a leak down tester as a compression tester. A leak down test is very specific and gives complementary data to a compression test. If you want to do a compression test get the proper tool. When testing an engine of unknown quality I always do both tests since the testers are not expensive.

**Q: Where is this made?**
A: China

**Q: Can anyone tell me if the attachments will fit down the spark plug well of bmw r1200 gs motorcycles, 2010-2012?**
A: Suitable for use on any petrol engine with 10, 12 or 14mm spark plugs.

**Q: Will this work on a jeep 4.0l? (2000 grand cherokee wj)**
A: Suitable for use on any petrol engine with 10, 12 or 14mm spark plugs. Tester checks the amount of leakage in an engine cylinder & helps determine the source. Ideal for testing trucks & late model cars where clearance is minimal.

## Customer Reviews

### ⭐⭐⭐⭐⭐ 







  
  
    Tester quickly identifies all types of  head gasket failures
  

*by D***H on Reviewed in the United States 🇺🇸 on 29 July 2020*

OEM makes a great line of reasonably priced, reasonably well made and reasonably accurate tools for the DIY automotive mechanic. Their Cylinder Leakage Tester is no exception. This tester has two different connection, Input air and Output air to cylinder. The Input connects to your 90-100psi shop air compressor with NPR Quick connect couplers and the Output connects to the cylinder under test a special Test Hose. The test hose has 14mm male threads to screw into the spark plug hole (hand tighten only) and a NPR Quick connector to connect to the Tester's Output port. Disconnect the Test hose to quickly calibrate the tester, then reconnect the Test hose and you will immediately see and hear results. Keep the ignition OFF. You may need to manually rotate the engine crankshaft with a wrench to bring the cylinder under test toward the TDC of its Compression Stroke so that the valves will both be shut and a "Good Cylinder" should not leak high pressure air being fed through the spark plug hole. Under this test condition, a blown head gasket will let high pressure air leak to either or both coolant passages or oil passages. Coolant expansion tanks may overflow as a result. Pressurized air may leak (and whistle?) from oil filler caps and /or Air-Oil separators. This tester can readily locate a blown head gasket that a Compression Test will completely miss.

### ⭐⭐⭐⭐⭐ 







  
  
    Works good enough
  

*by A***K on Reviewed in the United States 🇺🇸 on 23 November 2022*

This is certainly not a high end tool to compete with the professional brands but it does work as intended.  This needs at least 90 psi supply pressure.  No regrets with this purchase.

### ⭐⭐⭐ 







  
  
    Made it work despite poor air connections
  

*by C***G on Reviewed in the United States 🇺🇸 on 23 January 2021*

I like that this product worked (eventually), but the air connector was an ODD size.  The male connector on the gauge side of the tool would not fit in the female side of either of my air hoses, so I had to squeeze the tool on the hose and hold it while a friend helped me connect the spark plug hose adapter. It was a PAIN!  If I wasn't in a hurry to so the job I would've returned it for a properly fitting one but I needed to get the car back together.I don't have any idea why it didn't fit together, as you can see by the pics it looks like it should fit.  My guess is the tolerance from the factory is off by list enough for it to work.Overall you get what you pay for but I made it work well enough

## Frequently Bought Together

- New Leak Down Tester Tu-21 Engine Cylinder Leak Tester Leakage Detector Engine Compression Tester Gauges Set
- BETOOLL HW0130 8pcs Petrol Engine Cylinder Compression Tester Kit Automotive Tool Gauge

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