---
product_id: 50489973
title: "56603 Leak Sealer"
brand: "fernox"
price: "€ 184.84"
currency: EUR
in_stock: true
url: https://www.desertcart.es/products/50489973-56603-leak-sealer
store_origin: ES
region: Spain
---

# Stops leaks fast Compatible with all central heating systems Protects and extends system life 56603 Leak Sealer

**Brand:** fernox
**Price:** € 184.84
**Availability:** ✅ In Stock

## Summary

> 💧 Seal the deal on leaks before they seal your fate!

## Quick Answers

- **What is this?** 56603 Leak Sealer by fernox
- **How much does it cost?** € 184.84 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.es](https://www.desertcart.es/products/50489973-56603-leak-sealer)

## Best For

- fernox enthusiasts

## Why This Product

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

## Key Features

- • **Easy Application:** Simple 500ml bottle design for quick and mess-free treatment
- • **Rapid Leak Sealing:** Instantly seals leaks to keep your heating system running smoothly
- • **System Protection Boost:** Prevents corrosion and blockages, extending the lifespan of your heating system
- • **Universal Compatibility:** Works seamlessly with all types of central heating systems for hassle-free use
- • **Cost-Effective Maintenance:** Avoid expensive repairs by proactively sealing leaks and protecting your system

## Overview

Fernox 56603 Leak Sealer is a 500ml additive designed to rapidly seal leaks in all central heating systems, while protecting against corrosion and blockages to extend system life and reduce costly repairs.

## Description

Fernox Central Heating Leak Sealer F4 500ml

## Features

- Fernox Central Heating Leak Sealer F4 500ml

## Product Details

- **Material:** Silicone
- **Brand:** Fernox
- **Style:** Compact
- **Item dimensions L x W x H:** 8.27 x 3.86 x 2.68 inches
- **Water Resistance Level:** Water Resistant

## Images

![56603 Leak Sealer - Image 1](https://m.media-amazon.com/images/I/41E5s6gA6zL.jpg)

## Frequently Bought Together

- Fernox 56603 Leak Sealer
- Watts ETX-30 Non-Potable Water Carbon Steel Expansion Tank for Closed Loop Hydronic Heating System Piping, 1/2" MNPT Connection, Tank Volume 4.7 Gallons, Maximum Pressure 75 psi
- Fernox 57883 F4 Central Heating Leak Sealer - 1 Pint, White

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**Shop now:** [https://www.desertcart.es/products/50489973-56603-leak-sealer](https://www.desertcart.es/products/50489973-56603-leak-sealer)

---

*Product available on Desertcart Spain*
*Store origin: ES*
*Last updated: 2026-02-12*