---
product_id: 26791210
title: "Fernox LS-X External Leak Sealer and Jointing Compound, Yellow"
brand: "fernox"
price: "€ 68.78"
currency: EUR
in_stock: true
reviews_count: 2
category: "Fernox"
url: https://www.desertcart.gr/products/26791210-fernox-ls-x-external-leak-sealer-and-jointing-compound-yellow
store_origin: GR
region: Greece
---

# 100% leak-proof sealing Ready-to-use paste, no mixing Works from -10°C to 100°C Fernox LS-X External Leak Sealer and Jointing Compound, Yellow

**Brand:** fernox
**Price:** € 68.78
**Availability:** ✅ In Stock

## Summary

> 💧 Seal smart, stay leak-free, and never miss a drip!

## Quick Answers

- **What is this?** Fernox LS-X External Leak Sealer and Jointing Compound, Yellow by fernox
- **How much does it cost?** € 68.78 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/26791210-fernox-ls-x-external-leak-sealer-and-jointing-compound-yellow)

## 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

- • **Temperature Tough:** Performs flawlessly from freezing cold to boiling hot water systems, ensuring reliability year-round.
- • **Flexible & Reversible:** Never hardens rock solid; joints remain easy to undo for future maintenance or upgrades.
- • **Safe for What Matters:** WRAS approved and completely safe for drinking water applications—trust your joints with confidence.
- • **Effortless Leak Defense:** Fast-acting silicone paste seals leaks instantly, saving you time and hassle.
- • **Plug & Play Convenience:** Comes ready to use straight from the tube—no mixing, no mess, just seal and go.

## Overview

Fernox LS-X is a premium yellow silicone-based external leak sealer and jointing compound designed for compression joints and screwed fittings. WRAS approved for potable water, it remains flexible without hardening, works across extreme temperatures, and is ready to use without mixing. Ideal for professional-grade plumbing repairs that demand reliability and easy maintenance.

## Description

Product Description LS-X is a proven, fast acting, silicone paste which is used as an effective external leak sealer and jointing compound. It is designed for use on hot and cold water services, including potable water. Ideal for use on compression joints and screwed fittings. Never sets rock hard, joints can easily be undone. Ready to use, no mixing. Does not shrink or crack with age. Suitable for use from below freezing point to above boiling point of water. Completely safe to use with drinking water. WRAS – Approved Product. Manufacturers Code: LS-X Set Contains: 1 x LS-X Jointing Compound 50ml

Review: Outstanding product-good vendor - I read about this sealant in an online forum and must say that I have never used anything quite like it. It seems like a silicone type of sealant but stays somewhat soft. Even after opening the tube the contents remain usable for long after a year. I’ve used it on connections such as the wall to toilet tank line, under-sink plastic pipes, and clear plastic/vinyl tubing for a reverse osmosis system. A pre-application to these fittings prior to normal tightening has resulted in 100% leak proof joints. I highly recommend the product. The wait to obtain the product from the UK and the price may seem like an obstacle but the first time you use it you will understand. I have purchased it twice for two different locations.
Review: Does an excellent job of sealing high pressure leaks - Us this to patch up minor leaks of my pool's high pressure filter tank, and does 100% effective job (drying time overnight)

## Features

- Jointing compound and external leak
- Ideal for use on compression joints and screwed fittings
- WRAS Approved- Completely safe to use with drinking water
- Never sets rock hard; joints can easily be undone
- Ready to use, no mixing

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0051TPIQ6 |
| Best Sellers Rank | #715,951 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,796 in Hardware Sealers #42,160 in Pumps & Plumbing Equipment |
| Brand | Fernox |
| Brand Name | Fernox |
| Color | Yellow |
| Compatible Material | Porcelain, Ceramic, Metal, Silicone, Tubs, Fixtures, Sinks |
| Customer Reviews | 4.5 out of 5 stars 7 Reviews |
| Global Trade Identification Number | 05014551584341, 05014551999961 |
| Item Form | Paste |
| Item Type Name | External Leak Sealer and Jointing Compound |
| Item Weight | 0.07 Kilograms |
| Manufacturer | Alent |
| Material | Silicone |
| Material Type | Silicone |
| Model | LS-X |
| Number of Items | 1 |
| Part Number | LS-X |
| Supported Standards | WRAS |
| Surface Recommendation | [Tub, Fixture, Sink] |
| UPC | 772040563226 |
| Unit Count | 1.0 Count |
| Water Resistance Level | Water Resistant |

## Product Details

- **Material:** Silicone
- **Brand:** Fernox
- **Item Weight:** 0.13 Pounds
- **Compatible Material:** Porcelain, Ceramic, Metal, Silicone, Tubs, Fixtures, Sinks
- **Water Resistance Level:** Water Resistant

## Images

![Fernox LS-X External Leak Sealer and Jointing Compound, Yellow - Image 1](https://m.media-amazon.com/images/I/61H+hWYe0yL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Outstanding product-good vendor
*by A***R on January 23, 2024*

I read about this sealant in an online forum and must say that I have never used anything quite like it. It seems like a silicone type of sealant but stays somewhat soft. Even after opening the tube the contents remain usable for long after a year. I’ve used it on connections such as the wall to toilet tank line, under-sink plastic pipes, and clear plastic/vinyl tubing for a reverse osmosis system. A pre-application to these fittings prior to normal tightening has resulted in 100% leak proof joints. I highly recommend the product. The wait to obtain the product from the UK and the price may seem like an obstacle but the first time you use it you will understand. I have purchased it twice for two different locations.

### ⭐⭐⭐⭐⭐ Does an excellent job of sealing high pressure leaks
*by D***B on August 11, 2016*

Us this to patch up minor leaks of my pool's high pressure filter tank, and does 100% effective job (drying time overnight)

## Frequently Bought Together

- Fernox LS-X External Leak Sealer and Jointing Compound, Yellow
- XFasten Self Fusing Silicone Tape for Plumbing White 1" X 36-Foot Non-Adhesive Leak Seal Tape Waterproof, Silicone Grip Tape, Rubber Tape Thick for Pipe, Hose Repair Tape, Stop Leak Tape

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**Shop now:** [https://www.desertcart.gr/products/26791210-fernox-ls-x-external-leak-sealer-and-jointing-compound-yellow](https://www.desertcart.gr/products/26791210-fernox-ls-x-external-leak-sealer-and-jointing-compound-yellow)

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*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-07-04*