---
product_id: 50154348
title: "Pro-Line Radiator Stop Leak K | 250 ml | Cooler additive | SKU: 5178, red"
brand: "liqui moly"
price: "R771"
currency: ZAR
in_stock: true
category: "Liqui Moly"
url: https://www.desertcart.co.za/products/50154348-pro-line-radiator-stop-leak-k-250-ml-cooler-additive
store_origin: ZA
region: South Africa
---

# Works within 10 minutes Treats up to 40L coolant Seals small leaks fast Pro-Line Radiator Stop Leak K | 250 ml | Cooler additive | SKU: 5178, red

**Brand:** liqui moly
**Price:** R771
**Availability:** ✅ In Stock

## Summary

> 🚗 Seal the deal before your coolant runs dry!

## Quick Answers

- **What is this?** Pro-Line Radiator Stop Leak K | 250 ml | Cooler additive | SKU: 5178, red by liqui moly
- **How much does it cost?** R771 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/50154348-pro-line-radiator-stop-leak-k-250-ml-cooler-additive)

## Best For

- liqui moly enthusiasts

## Why This Product

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

## Key Features

- • **Trusted by Thousands:** 4.5-star rating from nearly 3,000 users who swear by its reliability
- • **Leak-Proof Confidence:** Stops hairline cracks & stone impact leaks without discolouring your coolant
- • **Long-Lasting Protection:** Keeps your cooling system sealed for months, avoiding costly repairs
- • **Universal Compatibility:** Perfect for passenger cars, commercial vehicles, and buses with water filters
- • **Quick & Easy Application:** Just shake, pour at operating temp, and run engine for 10 minutes

## Overview

Pro-Line Radiator Stop Leak K is a powerful 250 ml additive designed to quickly seal small leaks in vehicle cooling systems, treating up to 40 liters of coolant. Compatible with a wide range of vehicles, it works within 10 minutes without discolouring or blocking the coolant, backed by thousands of positive reviews and trusted by professionals.

## Description

LIQUI MOLY Pro-Line Radiator Stop Leak K | 250 ml | Cooler additive | SKU: 5178, red : desertcart.co.uk: Automotive

## Features

- Contains reaction mass of 5-chloro-2-methyl-2H-isothiazol-3-one and 2-methyl-2Hisothiazol-3-one (3:1). May produce an allergic reaction.
- Safety data sheet available on request.
- Small leaks caused by stone impacts, porous soldering points and hairline cracks in the cooling simple are easy to localize (one notices that the cooling water level is sinking).
- Used for sealing small leaks in cooling circuits of passenger motor vehicles, commercial vehicles and buses. Also suited for cooling water circuits equipped with water filters.
- Shake container before use. Start up the heater. With the engine running, pour the contents into the coolant at operating temperature and allow the engine to continue running for at least a further 10 minutes.
- Contents will treat up to 40 liters of coolant.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004FPUUSS |
| Best Sellers Rank | 5,544 in Automotive ( See Top 100 in Automotive ) 78 in Fillers, Adhesives & Sealants |
| Brand | Liqui Moly |
| Customer Reviews | 4.5 4.5 out of 5 stars (2,967) |
| Date First Available | 28 Aug. 2012 |
| Guaranteed software updates until | unknown |
| Item Weight | 275 g |
| Item model number | 5178 |
| Manufacturer | Liqui Moly |
| Manufacturer part number | 5178 |
| Model | Pro-Line Radiator Sealer K |
| OEM Part Number | 0 |
| Product Dimensions | 66.09 x 23.6 x 13.41 cm; 275 g |
| Viscosity | 2T |

## Images

![Pro-Line Radiator Stop Leak K | 250 ml | Cooler additive | SKU: 5178, red - Image 1](https://m.media-amazon.com/images/I/51AL1Pm7wmL.jpg)

## Frequently Bought Together

- LIQUI MOLY Pro-Line Radiator Stop Leak K | 250 ml | Cooler additive | SKU: 5178
- JOVS Jovs Antifreeze Coolant 5 Litre Long Life Red Ready Mixed Engine Coolant Ready to Use
- Wynn's Car Radiator Stop Leak Sealant Antifreeze Coolant Repair Additive 325ml

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**Shop now:** [https://www.desertcart.co.za/products/50154348-pro-line-radiator-stop-leak-k-250-ml-cooler-additive](https://www.desertcart.co.za/products/50154348-pro-line-radiator-stop-leak-k-250-ml-cooler-additive)

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-09-07*