Fernox LS-X Leak Sealer | Instant External Leak Repair

Fernox LS-X Leak Sealer

Stop Leaks Fast with Fernox LS-X Leak Sealer

A leaking pipe or fitting can quickly turn into an expensive problem if you leave it untreated. Fernox LS-X Leak Sealer provides a fast, reliable way to seal external leaks on plumbing and heating systems without waiting for lengthy curing times.

This high-performance silicone-based sealant creates a flexible, waterproof seal that bonds to most common plumbing materials. Whether you need to repair a weeping compression joint, seal threaded fittings or stop a minor external leak, Fernox LS-X delivers dependable performance when you need it most.

Unlike many traditional sealants, Fernox LS-X cures rapidly. As a result, you can complete repairs quickly and return your plumbing system to service with minimal disruption. The flexible seal also absorbs normal movement within pipework, helping maintain a durable, long-lasting repair.

Professional plumbers and heating engineers trust Fernox LS-X because it performs across a wide range of applications. Use it on compression fittings, threaded joints, valves, waste pipe connections and many other external plumbing repairs. Its compact tube fits easily into a toolbox, making it an essential product for both emergency call-outs and planned maintenance.

Manufactured by Fernox, one of the UK’s leading plumbing and heating brands, LS-X Leak Sealer combines ease of application with long-term reliability. Whether you’re repairing a minor leak or carrying out routine plumbing work, it offers a simple and effective sealing solution that saves both time and effort.

KEY FEATURES

• Creates fast, watertight external seals
• Flexible silicone-based formulation
• Rapid curing for quicker repairs
• Suitable for plumbing and heating systems
• Bonds to most common plumbing materials
• Ideal for compression fittings and threaded joints
• Excellent adhesion to damp surfaces
• Easy-to-use 50ml tube
• Trusted Fernox quality
• Suitable for professional and DIY use

TECHNICAL SPECIFICATIONS

THE PROBLEM IT SOLVES

Even a small plumbing leak can waste water and damage surrounding areas. Many leaks develop around threaded fittings, compression joints or valves, where a quick repair can prevent a much bigger problem.

Fernox LS-X Leak Sealer creates a durable waterproof seal around external joints and fittings. It helps stop leaks quickly while reducing downtime and avoiding unnecessary disruption.

WHY CHOOSE FERNOX LS-X LEAK SEALER?

When you need a dependable leak repair, speed matters. Fernox LS-X applies easily, cures quickly and creates a flexible seal that lasts.

Unlike many general-purpose sealants, it has been developed specifically for plumbing and heating applications. That means you can complete repairs with confidence while helping protect your pipework from future leaks.

PERFECT FOR

✔ Emergency plumbing repairs

✔ Compression fittings

✔ Threade

✔ Central heating systems

✔ Domestic plumbing

✔ Heating engineers

✔ Professional plumbers

✔ DIY home repairs

WHEN SHOULD I USE THIS PRODUCT?

Use Fernox LS-X Leak Sealer whenever you discover a small external leak on a plumbing or heating system. It works well on compression joints, threaded fittings, valves and many other external connections.

It also makes an excellent addition to every plumber’s toolbox because it provides a quick solution for unexpected leaks during installation or maintenance work.

COMPATIBLE PRODUCTS

• Fernox Water Hawk Jointing Compound
• Fernox Hawk White Jointing Compound
• PTFE Thread Seal Tape
• Compression Fittings
• Isolation Valves
• Central Heating Chemicals
• Underfloor Heating Manifolds

Next Working Day Delivery: Yes, we hold all our products in stock at our 7000 sq ft Nottingham warehouse and at our 3000 sq ft warehouse in Market Harborough and use DPD for a tracked next-day delivery.

Collection Available: You can always collect from our Nottingham location and help yourself to a free tea and coffee.