---
product_id: 531874932
title: "F4 Leak Sealer 500ml Liquid Seal for Central Heating Pipe Work Leaks Water Underfloor Heating Non-Corrosive Non-Toxic Compatible with Most Heating Systems Long-Lasting Seal"
brand: "kudos-trading"
price: "€ 82.58"
currency: EUR
in_stock: true
url: https://www.desertcart.nl/products/531874932-f4-leak-sealer-500ml-liquid-seal-for-central-heating-pipe
store_origin: NL
region: Netherlands
---

# Compatible with all pipe materials Rapid dispersion for minimal downtime Non-toxic & eco-friendly formula F4 Leak Sealer 500ml Liquid Seal for Central Heating Pipe Work Leaks Water Underfloor Heating Non-Corrosive Non-Toxic Compatible with Most Heating Systems Long-Lasting Seal

**Brand:** kudos-trading
**Price:** € 82.58
**Availability:** ✅ In Stock

## Summary

> 🚿 Seal leaks fast, stay worry-free—because your heating deserves the best!

## Quick Answers

- **What is this?** F4 Leak Sealer 500ml Liquid Seal for Central Heating Pipe Work Leaks Water Underfloor Heating Non-Corrosive Non-Toxic Compatible with Most Heating Systems Long-Lasting Seal by kudos-trading
- **How much does it cost?** € 82.58 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/531874932-f4-leak-sealer-500ml-liquid-seal-for-central-heating-pipe)

## Best For

- kudos-trading enthusiasts

## Why This Product

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

## Key Features

- • **Fast-Acting Seal:** Quick circulation ensures leaks are sealed before you know it.
- • **System-Safe Formula:** Non-corrosive and non-toxic—protects your heating system and the planet.
- • **Effortless Application:** Ready-to-use liquid formula—no mixing, no hassle.
- • **Universal Compatibility:** Seals leaks in metal, plastic, and composite pipes seamlessly.
- • **Long-Lasting Leak Protection:** Extends system lifespan by preventing costly repairs.

## Overview

Fernox F4 Leak Sealer is a 500ml ready-to-use, polymer-based liquid designed to quickly and reliably seal leaks in central heating and underfloor heating systems. Compatible with all common pipe materials, non-toxic, and eco-friendly, it ensures long-lasting protection without causing blockages or system damage.

## Description

F4 Leak Sealer 500ml Liquid Seal for Central Heating Pipe Work Leaks Water Underfloor Heating Non-Corrosive Non-Toxic Compatible with Most Heating Systems Long-Lasting Seal

## Features

- Easy-to-use formula: Fernox F4 Leak Sealer is designed for quick and hassle-free application. It comes as a ready-to-use liquid that doesn't require any additional mixing or preparation, making it convenient for homeowners and professionals alike.
- Effective sealing performance: This high-quality leak sealer is engineered to efficiently and reliably seal small, inaccessible leaks and weeping joints in hydronic heating systems. Its advanced formulation ensures a long-lasting and dependable sealing effect on various materials, including metal, plastic, and composite pipes.
- Compatible with all metals and materials: The versatile Fernox F4 Leak Sealer is suitable for use in systems containing a wide range of materials, such as copper, brass, steel, iron, aluminium, and plastics. This makes it a perfect solution for diverse heating systems, regardless of their construction and components.
- Non-toxic and environmentally friendly: Developed with safety and sustainability in mind, Fernox F4 Leak Sealer is non-toxic, non-corrosive, and non-flammable. Its eco-friendly formulation means that it is safe for use in all domestic heating systems and poses no harm to the environment.
- Rapid dispersion and circulation: The liquid formulation of the Fernox F4 Leak Sealer allows for quick and even distribution throughout the system, ensuring that the product reaches all areas where leaks may be present. This rapid circulation ensures effective sealing and minimal downtime for your heating system.
- Effective in both open and closed systems: Whether your heating system is an open-vented or sealed system, the Fernox F4 Leak Sealer is designed to deliver optimal sealing performance. Its versatility makes it a go-to solution for a wide range of system types.
- Does not cause blockages or restrictions: Fernox F4 Leak Sealer's unique formulation prevents the formation of any solid residues, ensuring that it will not cause blockages or restrictions within the heating system. This means you can trust it to deliver excellent sealing without compromising the efficiency of your system.
- Long-lasting protection: With its superior sealing performance and compatibility with a wide range of materials, Fernox F4 Leak Sealer provides long-lasting protection against leaks and weeping joints. This helps extend the lifespan of your heating system and minimize the need for costly repairs.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Kudos Trading |
| Part number | FER-56603 |
| Item Weight | 500 g |
| Product Dimensions | 18.2 x 8.8 x 5 cm; 500 g |
| Item model number | FER-56603 |
| Colour | White |
| Style | Brass,Work |
| Material | Polymer-based |
| Item Package Quantity | 1 |
| Batteries included? | No |
| Batteries Required? | No |

## Product Details

- **Material:** Polymer-based
- **Brand:** Kudos-Trading
- **Style:** Brass,Work
- **Item weight:** 500 Grams
- **Item dimensions L x W x H:** 18.2 x 8.8 x 5 centimetres

## Images

![F4 Leak Sealer 500ml Liquid Seal for Central Heating Pipe Work Leaks Water Underfloor Heating Non-Corrosive Non-Toxic Compatible with Most Heating Systems Long-Lasting Seal - Image 1](https://m.media-amazon.com/images/I/61Op0ICOl1L.jpg)
![F4 Leak Sealer 500ml Liquid Seal for Central Heating Pipe Work Leaks Water Underfloor Heating Non-Corrosive Non-Toxic Compatible with Most Heating Systems Long-Lasting Seal - Image 2](https://m.media-amazon.com/images/I/613jrMssrNL.jpg)
![F4 Leak Sealer 500ml Liquid Seal for Central Heating Pipe Work Leaks Water Underfloor Heating Non-Corrosive Non-Toxic Compatible with Most Heating Systems Long-Lasting Seal - Image 3](https://m.media-amazon.com/images/I/61F+hXSSZoL.jpg)
![F4 Leak Sealer 500ml Liquid Seal for Central Heating Pipe Work Leaks Water Underfloor Heating Non-Corrosive Non-Toxic Compatible with Most Heating Systems Long-Lasting Seal - Image 4](https://m.media-amazon.com/images/I/61AMHtTPJ3L.jpg)
![F4 Leak Sealer 500ml Liquid Seal for Central Heating Pipe Work Leaks Water Underfloor Heating Non-Corrosive Non-Toxic Compatible with Most Heating Systems Long-Lasting Seal - Image 5](https://m.media-amazon.com/images/I/719C0uNbLnL.jpg)

## Frequently Bought Together

- Fernox F4 Leak Sealer 500ml Liquid Seal for Central Heating Pipe Work Leaks Water Underfloor Heating Non-Corrosive, Non-Toxic, Compatible with Most Heating Systems, Easy to Use, Long-Lasting Seal.
- Just Dose It Central Heating Dosing Tool, Radiator Dosing Funnel - For Adding Chemicals Like Fernox Central Heating Inhibitor, Sludge Remover, Leak Sealer & Sentinel X100
- Fernox 56599 F1 500 ml Central Heating Protector

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-01-23*