---
product_id: 691417473
title: "1109 Block Seal Liquid Copper Intake and Radiator Stop Leak - 18 oz. (Pack of 2)"
brand: "bar's leaks"
price: "€ 31.60"
currency: EUR
in_stock: true
reviews_count: 13
category: "Bar's Leaks"
url: https://www.desertcart.ie/products/691417473-1109-block-seal-liquid-copper-intake-and-radiator-stop-leak
store_origin: IE
region: Ireland
---

# Universal coolant compatible No draining needed Permanent leak fix 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak - 18 oz. (Pack of 2)

**Brand:** bar's leaks
**Price:** € 31.60
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak - 18 oz. (Pack of 2) by bar's leaks
- **How much does it cost?** € 31.60 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/691417473-1109-block-seal-liquid-copper-intake-and-radiator-stop-leak)

## Best For

- bar's leaks enthusiasts

## Why This Product

- Trusted bar's leaks brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **One-Step Permanent Seal:** Just pour in and forget leaks—no mechanic needed.
- • **Versatile Leak Coverage:** Seals plastic, aluminum, cast iron, gaskets, freeze plugs & more.
- • **Heavy-Duty Copper Strength:** Copper-infused liquid glass penetrates and locks leaks tight.
- • **Cost-Effective Engine Savior:** Avoid expensive repairs and keep your ride running smooth.
- • **Antifreeze Compatible Formula:** Works seamlessly with all coolant types, no draining required.

## Overview

Bar's Leaks 1109 Liquid Copper Block Seal is a powerful, one-step radiator and intake leak fixer that permanently seals coolant leaks in cars, trucks, SUVs, and RVs. Compatible with all antifreeze types and requires no draining, it uses a copper-infused sodium silicate formula with fiber additives to penetrate and lock leaks in plastic, aluminum, and cast iron components—saving you costly repairs and downtime.

## Description

Bar’s Leaks® Liquid Copper™ Block Seal Coolant Leak Fix Stop Leak seals larger leaks regular stop leaks won’t. One step formula permanently repairs coolant loss problems on cars, trucks, vans, SUV’s and RV’s. Antifreeze compatible sodium silicate liquid glass penetrates large and small leaks in plastic, aluminum and cast iron heads, blocks, intake manifold & gaskets, freeze plugs, heater cores and radiators. Fiber additives lock together with liquid to increase strength and promote a permanent seal. It will not harm the coolingsystem when used properly, no draining is required. Use with ALL types of traditional or extended life coolant including yellow, orange, pink, red, blue, purple and green silicate based & non-silicate based (OAT/HOAT) 50-50 mix antifreeze, and/or water.

Review: Thank you Bar’s Leak Sealant!! Something that actually works! - OMG thank you for this wonderful product!! I used it in my old skid steer which was leaking a lot and overheating. Replacing the radiator does not seem to be an option- it’s above my ability and can’t find a mechanic to work on it. I had tried other radiator seal products with unsustainable results. As a last ditch effort I ordered this Bar’s copper block seal and it WORKS!!!! It has been several months and is still working, I am so very happy. The cost is a bit higher than the other products that did not work. For any future problems I won’t waste my money on cheaper products, this product is totally worth the extra few dollars. In the end it has literally saved me hundreds of dollars.
Review: Quick, Effective, and Easy One‑Step Fix - Bar’s Leaks Liquid Copper Block Seal really delivers. The one‑step formula makes it simple to use—just pour it in and let it circulate. Within a short time, it sealed a small radiator leak and stopped coolant loss without any complicated process or extra tools. The 18 oz. size is generous enough for most vehicles, and the copper formula feels more heavy‑duty compared to standard stop leaks. It saved me from an expensive repair and kept the engine running smoothly. For anyone dealing with minor intake or radiator leaks, this product is a reliable, cost‑effective solution that works exactly as advertised.

## Features

- The information below is per-pack only
- PERMANENTLY FIXES COOLING SYSTEM LEAKS: . One step formula permanently repairs coolant loss problems on cars, trucks, vans, SUV’s and RV’s.
- ANTIFREEZE COMPATIBLE - NO DRAINING REQUIRED: Antifreeze compatible sodium silicate liquid glass penetrates large and small leaks in plastic, aluminum and cast iron heads, blocks, intake manifold & gaskets, freeze plugs, heater cores and radiators.
- ONE STEP - POUR DIRECTLY INTO RADIATOR - EASY TO USE: Fiber additives lock together with liquid to increase strength and promote a permanent seal. It will not harm the coolingsystem when used properly, no draining is required.
- USE WITH ALL TYPES OF TRADITIONAL OR EXTENDED LIFE COOLANT: Use with ALL types of traditional or extended life coolant including yellow, orange, pink, red, blue, purple and green silicate based & non-silicate based (OAT/HOAT) 50-50 mix antifreeze, and/or water.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0DC7TX8SJ |
| Best Sellers Rank | #4,604 in Automotive ( See Top 100 in Automotive ) #1 in Radiator Sealers |
| Brand | Bar's Leaks |
| Color | copper |
| Customer Reviews | 4.3 4.3 out of 5 stars (1,425) |
| Date First Available | January 23, 2026 |
| Is Discontinued By Manufacturer | No |
| Item Form | Liquid |
| Item Weight | 2.6 pounds |
| Item dimensions L x W x H | 7.5 x 2.6 x 2.6 inches |
| Item model number | 1109 |
| Manufacturer | Bar's Leaks |
| Manufacturer Part Number | 1109 |
| Material | Plastic |
| Number of Items | 2 |
| Product Dimensions | 7.5 x 2.6 x 2.6 inches |
| Style | 1 Pack |
| Surface Recommendation | Automotive |
| Unit Count | 2.0 Count |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** Bar's Leaks
- **Item Weight:** 2.6 Pounds
- **Item dimensions L x W x H:** 7.5 x 2.6 x 2.6 inches
- **Material:** Plastic
- **Style:** 1 Pack

## Images

![1109 Block Seal Liquid Copper Intake and Radiator Stop Leak - 18 oz. (Pack of 2) - Image 1](https://m.media-amazon.com/images/I/71Zwol9WVML.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Thank you Bar’s Leak Sealant!! Something that actually works!
*by G***N on January 11, 2026*

OMG thank you for this wonderful product!! I used it in my old skid steer which was leaking a lot and overheating. Replacing the radiator does not seem to be an option- it’s above my ability and can’t find a mechanic to work on it. I had tried other radiator seal products with unsustainable results. As a last ditch effort I ordered this Bar’s copper block seal and it WORKS!!!! It has been several months and is still working, I am so very happy. The cost is a bit higher than the other products that did not work. For any future problems I won’t waste my money on cheaper products, this product is totally worth the extra few dollars. In the end it has literally saved me hundreds of dollars.

### ⭐⭐⭐⭐⭐ Quick, Effective, and Easy One‑Step Fix
*by M***L on November 18, 2025*

Bar’s Leaks Liquid Copper Block Seal really delivers. The one‑step formula makes it simple to use—just pour it in and let it circulate. Within a short time, it sealed a small radiator leak and stopped coolant loss without any complicated process or extra tools. The 18 oz. size is generous enough for most vehicles, and the copper formula feels more heavy‑duty compared to standard stop leaks. It saved me from an expensive repair and kept the engine running smoothly. For anyone dealing with minor intake or radiator leaks, this product is a reliable, cost‑effective solution that works exactly as advertised.

### ⭐⭐⭐⭐ Good interim solution for a larger problem
*by M***Y on October 28, 2025*

Purchased this as a ‘band-aid’ fix to get me to my repair destination. While I have relied on this leak sealant before more upwards of 8 months, it is recommended that you use this as an interim solution and resolve your larger issue as time and money allow. When using it, follow the instructions and ideally only use it AS NEEDED. Research suggests that overuse or reliance on products such as this can lead to larger problems.

## Frequently Bought Together

- Bar's Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak - 18 oz. (Pack of 2)
- Bar's Leaks Rear Main Seal Repair, 16.9 oz
- Bar's Leaks OS-1 Oil Seal Engine Oil Burning and Leak Repair, 16.9 oz.

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-03-12*