---
product_id: 691417473
title: "Bar's Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak - 18 oz. (Pack of 2)"
brand: "bar's leaks"
price: "€ 40.31"
currency: EUR
in_stock: true
reviews_count: 13
category: "Bar's Leaks"
url: https://www.desertcart.hr/products/691417473-bars-leaks-1109-block-seal-liquid-copper-intake-and-radiator
store_origin: HR
region: Croatia
---

# Compatible with all coolant types No draining needed Permanent leak fix Bar's Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak - 18 oz. (Pack of 2)

**Brand:** bar's leaks
**Price:** € 40.31
**Availability:** ✅ In Stock

## Summary

> 🚗 Seal the deal, skip the shop—cooling leaks fixed like a pro!

## Quick Answers

- **What is this?** Bar's Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak - 18 oz. (Pack of 2) by bar's leaks
- **How much does it cost?** € 40.31 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/691417473-bars-leaks-1109-block-seal-liquid-copper-intake-and-radiator)

## 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

- • **No System Damage:** Safe for your cooling system when used as directed—no draining required.
- • **Fiber-Enhanced Strength:** Advanced fiber additives lock in place to reinforce the seal.
- • **One-Step Permanent Seal:** Pour directly into radiator for an effortless, lasting fix.
- • **Multi-Material Penetration:** Seals leaks in plastic, aluminum, and cast iron components.
- • **Universal Coolant Compatibility:** Works seamlessly with all traditional and extended life antifreeze blends.

## Overview

Bar's Leaks 1109 Liquid Copper Block Seal is a powerful, one-step coolant leak repair solution that permanently seals leaks in a variety of engine components without draining your system. Compatible with all coolant types and reinforced with fiber additives, it offers a durable, hassle-free fix trusted by thousands to save costly repairs.

## 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: Works well, stopped a minor leak in 2002 vortec v6 - I've used this stuff twice in 20 years and both time it worked great. The first was in a 1998 grand cherokee that was driven across town with low coolant resulting in a blown head gasket or cracked cylinder head. The second a 2002 S10 v6 that ran great but consumed a half gallon of coolant every few days. In both cases I added the full bottle and drove the car. In the case of the S10 it took a couple days driving to work but it's been a month now and no leaks. Saved me a ton of work replacing the head gasket and/or cylinder head(s).
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.

## 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 | #6,674 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 (1,452) |
| 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

![Bar's Leaks 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)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works well, stopped a minor leak in 2002 vortec v6
*by M***E on March 1, 2026*

I've used this stuff twice in 20 years and both time it worked great. The first was in a 1998 grand cherokee that was driven across town with low coolant resulting in a blown head gasket or cracked cylinder head. The second a 2002 S10 v6 that ran great but consumed a half gallon of coolant every few days. In both cases I added the full bottle and drove the car. In the case of the S10 it took a couple days driving to work but it's been a month now and no leaks. Saved me a ton of work replacing the head gasket and/or cylinder head(s).

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐ Yes but didnt work for me for other issues.
*by H***F on January 29, 2026*

Gonna give it 4 stars because my husband used it before and its worked. But for my van it didnt and it was a issue that this couldn't solve. So could return it. That the only downfall but my husband recommended it and has used it before.

## 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 Croatia*
*Store origin: HR*
*Last updated: 2026-04-23*