---
product_id: 143498775
title: "Permatex 81878 3 Oz Ultra Copper RTV Silicone Gasket Maker (2 Pack)"
brand: "permatex"
price: "¥13997"
currency: JPY
in_stock: true
reviews_count: 6
category: "Permatex"
url: https://www.desertcart.jp/products/143498775-permatex-81878-3-oz-ultra-copper-rtv-silicone-gasket-maker
store_origin: JP
region: Japan
---

# Ultra-high temp resistance up to 700°F 2-pack value for double the repairs RTV silicone for flexible, durable sealing Permatex 81878 3 Oz Ultra Copper RTV Silicone Gasket Maker (2 Pack)

**Brand:** permatex
**Price:** ¥13997
**Availability:** ✅ In Stock

## Summary

> 🔥 Seal the deal with ultra-copper strength!

## Quick Answers

- **What is this?** Permatex 81878 3 Oz Ultra Copper RTV Silicone Gasket Maker (2 Pack) by permatex
- **How much does it cost?** ¥13997 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/143498775-permatex-81878-3-oz-ultra-copper-rtv-silicone-gasket-maker)

## Best For

- permatex enthusiasts

## Why This Product

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

## Key Features

- • **Heatproof Hero:** Withstands extreme exhaust manifold temperatures up to 700°F, ensuring a reliable, long-lasting seal.
- • **Trusted by Pros:** Highly rated with a 4.6-star average, this sealant is a go-to for automotive experts and DIYers alike.
- • **Double the Power:** Two tubes in one pack mean you’re ready for multiple repairs or projects—never run out mid-job.
- • **Flexible & Durable:** RTV silicone formula adapts to engine vibrations and thermal expansion without cracking or shrinking.
- • **Time-Saving Solution:** Eliminates the need for original gaskets, saving hours on exhaust manifold repairs.

## Overview

Permatex 81878 Ultra Copper RTV Silicone Gasket Maker is a high-temperature resistant sealant designed for exhaust manifold repairs. This 2-pack offers flexible, durable sealing that withstands up to 700°F, saving time and effort by replacing traditional gaskets. Trusted by professionals and DIY enthusiasts, it delivers reliable performance and long-lasting protection.

## Description

Permatex 81878 3 Oz Ultra Copper RTV Silicone Gasket Maker (2 PACK)

Review: Fantastic sealant for Exhausts manifolds - This is superb for sealing exhaust manifolds, I have used this when I could not get the original gasket, worked first time, saved me hours! I cant recommend this enough!
Review: Shows 2 tubes in the picture. Description says 2 pack. Costs about what you'd expect for two tubes, but you only get one. Just go down to the local auto parts store.

## Features

- Causes serious eye irritation.
- May cause an allergic skin reaction.
- Suspected of causing cancer.
- 2 PACK

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01LZ7WZAT |
| Best Sellers Rank | 327,211 in Automotive ( See Top 100 in Automotive ) 1,052 in Fillers, Adhesives & Sealants |
| Brand | Permatex |
| Customer Reviews | 4.6 4.6 out of 5 stars (123) |
| Date First Available | 21 Sept. 2016 |
| Item Weight | 181 g |
| Item model number | 81878 |
| Manufacturer | ITW Global Brands |
| Manufacturer part number | 81878 |
| Model | Permatex |
| Product Dimensions | 6.6 x 9.65 x 20.32 cm; 181.44 g |

## Product Details

- **Brand:** Permatex
- **Colour:** Black
- **Item form:** Paste
- **Item weight:** 0.4 Pounds
- **Liquid volume:** 3 Fluid Ounces

## Images

![Permatex 81878 3 Oz Ultra Copper RTV Silicone Gasket Maker (2 Pack) - Image 1](https://m.media-amazon.com/images/I/91P4MvrwZsL.jpg)

## Questions & Answers

**Q: I have a very old crown stove that has asbestos gaskets between the top and bottom parts of each burner that have shrunken badly,Would this fill gaps?**
A: Keep the Asbestos between the RTV and steel and you will probably be fine. I just used this(product) with some New Fiberglass woodstove rope on my Kitchen Oven, for a Door Gasket. It held Better than the glue they give you with the Fireplace Gasket.

**Q: Do you get two tubes?**
A: They sent me 1 3oz tube instead of the 2 pack with a total of 6.4 oz like description states. Contact customer service like i did to get it taken care of.

**Q: Will this work to make a seal with an oil pan?**
A: No, this product is intended for high temperature uses "Exhaust manifolds, Headers". You'd be better off with a product like the Right Stuff, we used it a lot for sealing diesel engine oil pans. https://www.amazon.com/Permatex-29208-Right-Stuff-Gasket/dp/B000HBNV8U/ref=sr_1_1?crid=32S5CHICLZZCI&keywords=Rightstuff&qid=1684392092&s=automotive&sprefix=rightstuff%2Cautomotive%2C66&sr=1-1

**Q: Can i use this to adhere an after market clutch cover on a motorcycle!?**
A: The Permatex 81878 3 Oz Ultra Copper RTV Silicone Gasket Maker is a product commonly used for creating reliable, high-temperature seals on various automotive applications, including engines, transmission components, and other parts that require a durable gasket or sealant.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Fantastic sealant for Exhausts manifolds
*by P***N on 10 July 2023*

This is superb for sealing exhaust manifolds, I have used this when I could not get the original gasket, worked first time, saved me hours! I cant recommend this enough!

### ⭐ Review
*by A***R on 20 December 2021*

Shows 2 tubes in the picture. Description says 2 pack. Costs about what you'd expect for two tubes, but you only get one. Just go down to the local auto parts store.

### ⭐⭐⭐⭐⭐ Review
*by A***R on 30 December 2022*

Worked great on old Harley Davidson exhaust gasket

## Frequently Bought Together

- Permatex 81878 3 Oz Ultra Copper RTV Silicone Gasket Maker (2 Pack)
- Permatex 85080 Ultra Black Maximum Oil Resistance RTV Silicone Gasket Maker, Sensor Safe And Non-Corrosive, For High Flex And Oil Resistant Applications 9.5 oz
- Permatex 81630 Ultra Red High Temperature Gasket Maker, 3 oz

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-17*