---
product_id: 356044051
title: "Nu-Calgon 4050-11 EasySeal Ultimate LS/UV (0.1 oz. Vessel)"
brand: "nu-calgon"
price: "€ 91.15"
currency: EUR
in_stock: true
reviews_count: 5
category: "Nu Calgon"
url: https://www.desertcart.ie/products/356044051-nu-calgon-4050-11-easyseal-ultimate-ls-uv-0-1
store_origin: IE
region: Ireland
---

# Rapid fusion tech for instant sealing Brighter UV dye for leak detection Direct inject, easy professional installation Nu-Calgon 4050-11 EasySeal Ultimate LS/UV (0.1 oz. Vessel)

**Brand:** nu-calgon
**Price:** € 91.15
**Availability:** ✅ In Stock

## Summary

> 🔧 Seal leaks like a pro—fast, flawless, and foolproof!

## Quick Answers

- **What is this?** Nu-Calgon 4050-11 EasySeal Ultimate LS/UV (0.1 oz. Vessel) by nu-calgon
- **How much does it cost?** € 91.15 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/356044051-nu-calgon-4050-11-easyseal-ultimate-ls-uv-0-1)

## Best For

- nu-calgon enthusiasts

## Why This Product

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

## Key Features

- • **Seal Big Leaks Fast:** Permanently seals large leaks with cutting-edge rapid fusion technology, saving you costly downtime.
- • **Effortless Application:** Direct inject design means quick, mess-free installation—get your system leak-free without the hassle.
- • **Universal Compatibility:** Works seamlessly with all refrigerants and systems up to 10 tons in one application—versatility that professionals trust.
- • **Enhanced Leak Visibility:** New brighter UV dye makes pinpointing leaks easier than ever, ensuring no drip goes unnoticed.
- • **Trusted Industry Standard:** From Nu-Calgon, a leader in HVAC chemicals, guaranteeing professional-grade quality and reliability.

## Overview

Nu-Calgon 4050-11 EasySeal Ultimate LS/UV is a professional-grade leak sealant designed for rapid, permanent sealing of large leaks in HVAC and refrigeration systems. Featuring advanced rapid fusion technology and a brighter UV dye for easy leak detection, it works with all refrigerants and systems up to 10 tons. Trusted by technicians for its ease of use and reliable performance, this 0.1 oz vessel delivers a quick, mess-free solution to keep your cooling systems running flawlessly.

## Description

The EasySeal line has proven to be the number one trusted leak sealant brand for years, with millions of leaks sealed. Now Nu-Calgon has made EasySeal even better with EASYSEAL ULTIMATE – the strongest and fastest leak sealant on the market, now with the ability to treat systems up to 10 tons in one application! THE NU-CALGON 4050-11 EASYSEAL ULTIMATE LS/UV IS FOR PROFESSIONAL USE AND SHOULD ONLY BE USED IN ACCORDANCE WITH ALL REGULATIONS AND PROPER SERVICE PRACTICES. PLEASE SEE PRODUCT LABEL OR CONTACT NU-CALGON DIRECTLY FOR USE INSTRUCTION. IT IS RECOMMENDED TO UTILIZE THE APPROPRIETE PPE (PERSONAL PROTECTIVE EQUIPMENT) DURING APPLICATION.

Review: This is effective and easy to apply - This product delivers. It was pumped into A/C system that had a leak, compromising the quantum of cool air being released. Once it was pumped in, the cool air became steady and even, responding to the thermostat. If your A/C system has a slow leak, get it; it will fix it. It is easy. Just follow the directions.
Review: Got my AC back up and running - I bought this product based on what the AC tech told me he uses. I used this product and charged my AC in July of 2023 and it worked all season. It is now June 2024 and my AC is still ice cold. This product definitely sealed the leak.

## Features

- The genuine Nu-Calgon 4050-11 is the EasySeal Ultimate LS/UV and is considered a leak sealant.
- EasySeal Ultimate LS/UV permanently seals large leaks with rapid fusion technology for a stronger bond.
- The Nu-Calgon 4050-11 is easiest to install with direct inject and works with all refrigerants.
- Nu-Calgon EasySeal Ultimate LS/UV has new brighter UV dye.
- Nu-Calgon, the brand you trust, provides quality chemicals and specialty products for professional use only in the air conditioning, refrigeration and heating markets.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07LBGHT6Q |
| Batteries Required? | No |
| Best Sellers Rank | #365,768 in Automotive ( See Top 100 in Automotive ) #79 in Refrigerants |
| Customer Reviews | 4.1 4.1 out of 5 stars (22) |
| Date First Available | December 12, 2018 |
| Included Components | Single Nu-Calgon 4050-11 EasySeal Ultimate LS/UV (0.1 oz. Vessel) |
| Item Package Quantity | 1 |
| Item Weight | 3.98 ounces |
| Item model number | 4050-11 |
| Manufacturer | Nu-Calgon |
| Part Number | 4050-11 |
| Product Dimensions | 0.75 x 0.75 x 9.5 inches |
| Usage | Leak Sealant |

## Images

![Nu-Calgon 4050-11 EasySeal Ultimate LS/UV (0.1 oz. Vessel) - Image 1](https://m.media-amazon.com/images/I/61BpmON0M6S.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ This is effective and easy to apply
*by B***. on July 30, 2025*

This product delivers. It was pumped into A/C system that had a leak, compromising the quantum of cool air being released. Once it was pumped in, the cool air became steady and even, responding to the thermostat. If your A/C system has a slow leak, get it; it will fix it. It is easy. Just follow the directions.

### ⭐⭐⭐⭐⭐ Got my AC back up and running
*by J***9 on June 25, 2024*

I bought this product based on what the AC tech told me he uses. I used this product and charged my AC in July of 2023 and it worked all season. It is now June 2024 and my AC is still ice cold. This product definitely sealed the leak.

### ⭐⭐⭐⭐ $80 vs $5000
*by J***7 on June 16, 2025*

So if you have determined that you have a relatively small leak, ( not for large leaks) after the second time putting this product it worked and is still working. Learn from my mistake. Be sure to fill the system with the required gas ( Freon )to its capacity for good results! Remember this is a temporary fix and will give you time to plan for your replacement . They are getting more expensive by the day!

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-03-13*