--- product_id: 49191272 title: "Fernox 603022 Ls-X Leak Sealer External, 50 g" brand: "fernox" price: "€ 33.77" currency: EUR in_stock: true reviews_count: 8 url: https://www.desertcart.hr/products/49191272-fernox-603022-ls-x-leak-sealer-external-50-g store_origin: HR region: Croatia --- # WRAS Approved for drinking water safety Operates from freezing to boiling temps Ready-to-use, no mixing required Fernox 603022 Ls-X Leak Sealer External, 50 g **Brand:** fernox **Price:** € 33.77 **Availability:** ✅ In Stock ## Summary > 💧 Seal leaks like a pro—fast, safe, and hassle-free! ## Quick Answers - **What is this?** Fernox 603022 Ls-X Leak Sealer External, 50 g by fernox - **How much does it cost?** € 33.77 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/49191272-fernox-603022-ls-x-leak-sealer-external-50-g) ## 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 - • **Certified Safe:** WRAS approved—completely safe for potable water systems - • **Flexible & Reversible:** Never hardens rock solid; joints can be undone easily - • **Leak-Proof Confidence:** Fast-acting silicone paste seals external leaks instantly - • **Effortless Application:** Ready to use straight from the tube—no mixing, no mess - • **Universal Compatibility:** Works perfectly on compression joints and screwed fittings ## Overview Fernox LS-X Leak Sealer is a 50g silicone paste designed for quick, reliable external leak sealing on compression joints and screwed fittings. WRAS approved for safe use with drinking water, it remains flexible without hardening, allowing easy joint disassembly. Ready to use with no mixing, it performs across extreme temperatures from below freezing to boiling. ## 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 Box Contains 1 x LS-X External Leak Sealer Tube 50ml and instructions ## 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 | 64,544 in DIY & Tools (See Top 100 in DIY & Tools) 935 in Sealers 2,259 in Pumps & Plumbing Equipment | | Brand | Fernox | | Colour | Yellow | | Compatible Material | Various materials | | Customer Reviews | 4.4 4.4 out of 5 stars (1,360) 4.4 out of 5 stars | | Global Trade Identification Number | 05014551584341, 05014551999961 | | Included Components | Sealer | | Item Form | Paste | | Item Type Name | LS-X LEAK SEALER EXTERNAL 50 GM | | Item Weight | 0.07 Kilograms | | Manufacturer | Fernox | | Manufacturer Part Number | LS-X | | Material | Silicone | | Model Number | LS-X | | Number Of Items | 1 | | Number Of Packs | 1 | | Style Name | Compact | | Supported Standards | WRAS | | Surface Recommendation | Wall, Floor, Ceiling, Pipe | | Unit Count | 1.0 gram | | Upc | 772040563226 | | Water Resistance Level | Water Resistant | ## Product Details - **Material:** Silicone - **Brand:** Fernox - **Style:** Compact - **Item weight:** 59 g - **Water resistance level:** Waterproof ## Images ![Fernox 603022 Ls-X Leak Sealer External, 50 g - Image 1](https://m.media-amazon.com/images/I/61H+hWYe0yL.jpg) ## Questions & Answers **Q: Is this product suitable for leaking cast iron joint of a drainage pipe?** A: As long as the joint isn't under pressure, (mains supply ) I have found it stops leaks in most cases , just clean off joint , apply product pushing into crevice or thread, it will then set to a jelly kind of substance when it comes into contact with water , good product for most applications so cant see why it wont work **Q: Canthis be used to seal a leak that in a shower fitting that is spraying at high pressure when used?** A: Depends on the size of the hole but i would say yes. Sealed water pressure at 2 bar with this stuff. **Q: Will this seal a leak in a campervan where the pipe has disconnected from the tap?** A: If the pipe has completely disconnected then this sealant will not help. If you are able to re-connect the pipe to the tap, a smear of the sealant on the connection before tightening it will help to stop a small leak (dripping). The sealant is very good for stopping drips and small leaks. It can't be used as a substitute for good plumbing. **Q: How do you apply this stuff?** A: Just to correct the early reply, Fernox's own site states LS-X is suitable for both compression and screw fittings. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Really useful sealant for irrigation and watering applications *by on Reviewed in the United Kingdom 20 June 2019* This is just like aquarium sealant, which works out cheaper, but requires a caulk gun, and I didn't want to have to use one every time I want to seal a joint. Brilliant for screw-in or push-in irrigation or hose fittings instead of PTFE tape - works a lot better. You can undo the connections, although might require a bit more strength than PTFE sealed joints. It also sticks to most surfaces, including to PP (polypropylene plastic) - tried other solutions, but none worked as well as this. I sand down the plastic, make sure surface is clean & dry and use quite a lot. For example, sealing the outflow on a water barrel.. my application was not that, but it's a comparable job. For screw-in connections or surfaces with better adhesion, you don't need a lot.You can put it on wet surfaces but it's a lot easier if they're dry - if it's still leaking, I find it much harder to get a good seal, and it definitely won't work if the system is under pressure, but other than that, it's worked every time for me.I've not yet tried to seal fittings in LDPE/HDPE (normally nothing will stick to it) pipes, but think it would work if connections/fittings are PP or that black rubbery stuff (it defo sticks to those).It sets quite quickly - in low pressure systems, provides a good seal within an hour to few hours, depending how thick. It starts setting within 10 mins, so you have to work quite quickly.You can't sand and paint it like plumber's epoxy, as it's still flexible when dry, but personally, I found plumber's epoxy horrible - nowhere near as good as this.I didn’t find it that easy to work with, but that's inherent in the material - it's not quite as sticky as most glues, but same consistency, and tends to stick to tools or hands. I tried various tools to apply or smooth it (a washing-up liquid wetted knife is recommended, I think), but found fingers work best for me - I also can't ever get filler smooth, so maybe it's just me (as you can see, it’s not smooth!).It can be hard to remove from skin - I found baby wipes best, for both skin and cleaning tools. It’s keeping well so far (3 months), a dry layer forms on the opening, but it's easy to remove.I will definitely buy this again when I run out, and would recommend this for all sorts of jobs... ### ⭐⭐⭐⭐⭐ The number one sealant. *by on Reviewed in the United Kingdom 2 July 2019* I first used this sealer way back in the early nineties to fix a leak in a hot water boiler tank in a mobile home, it worked superbly, and over the years it’s continued to serve me well on every application I’ve put it to. This time round I needed it to seal a puncture in the inflatable ring of an inter self riser swimming pool, and again it gave excellent results, what I like most about this stuff, is the fact that you can use it under water to seal leaks, cracks and punctures whilst tanks, radiators, pools, and the like are still in use. Fernox is without doubt the best leak sealer on the market, I reach for it every time, and after 27 years of use, it’s never let me down, it’s the same formula today as it was then, and that’s because you can’t improve upon perfection. ### ⭐⭐⭐⭐ Can't be without a tube of LS-X *by on Reviewed in the United Kingdom 8 May 2019* Great product which has helped me out a lot over the years. Very effective on leaks and will ensure a good seal on old plastic pipework especially those that run under the sink and flooring. Equally easy to undo joints that have been sealed with LS-X for years. My only bugbear is that it tends to cure itself in the tube and I have to resort to clipping the bottom of the tube off to get the stuff out. ## 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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/49191272-fernox-603022-ls-x-leak-sealer-external-50-g](https://www.desertcart.hr/products/49191272-fernox-603022-ls-x-leak-sealer-external-50-g) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-08-26*