---
product_id: 10320742
title: "International 18-3569 Marine Thermostat Kit for Mercury/Mariner Outboard Motor"
brand: "sierra"
price: "VT10584"
currency: VUV
in_stock: true
reviews_count: 12
category: "Sierra"
url: https://www.desertcart.vu/products/10320742-international-18-3569-marine-thermostat-kit-for-mercury-mariner-outboard
store_origin: VU
region: Vanuatu
---

# Complete gasket & thermostat kit included Fits 70-125 HP Mercury/Mariner 2-cycle outboards Precise 120°F temperature rating International 18-3569 Marine Thermostat Kit for Mercury/Mariner Outboard Motor

**Brand:** sierra
**Price:** VT10584
**Availability:** ✅ In Stock

## Summary

> 🌊 Keep your engine cool and your adventures hotter!

## Quick Answers

- **What is this?** International 18-3569 Marine Thermostat Kit for Mercury/Mariner Outboard Motor by sierra
- **How much does it cost?** VT10584 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/10320742-international-18-3569-marine-thermostat-kit-for-mercury-mariner-outboard)

## Best For

- sierra enthusiasts

## Why This Product

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

## Key Features

- • **All-in-One Kit:** Includes thermostat, thermostat gasket, and cover gasket—everything you need for a professional-grade replacement in one package.
- • **Lightweight & Durable:** Crafted from premium metal materials weighing just 0.08 lbs, combining durability with easy handling and installation.
- • **OEM Quality Assurance:** Meets or exceeds original equipment standards and is fully interchangeable with top brands like GLM, Mallory, and Mercury Marine.
- • **Seamless Compatibility:** Engineered to fit Mercury/Mariner 70-125 HP 2-cycle outboards from 1987 onwards, ensuring hassle-free installation and peak performance.
- • **Optimal Temperature Control:** Maintains a precise 120°F operating temperature to protect your engine and maximize efficiency on every voyage.

## Overview

The Sierra International 18-3569 Marine Thermostat Kit is a precision-engineered replacement part designed for Mercury/Mariner 70-125 HP 2-cycle outboard motors (1987+). Featuring a 120°F temperature rating and including all necessary gaskets, this lightweight, durable kit ensures reliable engine temperature regulation and seamless compatibility with OEM standards, making it the go-to choice for marine professionals and enthusiasts alike.

## Description

Sierra's 18-3569 Thermostat Kit fits various Mercury/Mariner 70-125 HP 2 cycle outboards (1987 and newer). The kit includes (1) 18-0182 Thermostat Gasket, (1) 18-0339 Thermostat Cover Gasket, and (1) 18-3549 Thermostat. It is interchangeable with GLM 13124, Mallory 9-43155, and Mercury Marine 803061T1. Each Sierra product meets or exceeds the original equipment part it replaces.

Review: Good part decent price - Fit and worked well
Review: Perfect fit - Fit perfect on 1996 mercury 115 2 stroke.

## Features

- Fits : Various Mercury/Mariner 70-125 hp 2 cycle outboards (1987 and newer)
- Temperature Rating: 120°F

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000N9NXLG |
| Additional Features | Adjustable |
| Backlight | No |
| Best Sellers Rank | #853,303 in Automotive ( See Top 100 in Automotive ) #1,691 in Automotive Replacement Engine Thermostats |
| Brand Name | Sierra |
| Color | White |
| Connectivity Protocol | Wi-Fi |
| Connectivity Technology | Wi-Fi |
| Control Method | Touch |
| Control Type | Touchpad Control |
| Controller Type | Touch |
| Customer Reviews | 4.5 4.5 out of 5 stars (155) |
| Display Type | touchscreen |
| Global Trade Identification Number | 00808282112899 |
| Included Components | Sierra 18-3569 Thermostat Kit |
| Item Dimensions D x W x H | 5"D x 8.9"W x 5"H |
| Item Type Name | Sierra 18-3569 Thermostat Kit |
| Item Weight | 0.08 Pounds |
| Manufacturer | Sierra |
| Manufacturer Warranty Description | Limited warranty. |
| Material Type | Metal |
| Model Name | Sierra 18-3569 Thermostat Kit |
| Model Number | 18-3569 |
| Mounting Type | Bracket Mount |
| Power Source | Battery Powered |
| Product Style | Classic |
| Specific Uses For Product | Marine Outboard Motor Control |
| Temperature Control Type | Thermostatic |
| UPC | 808282112899 |
| Unit Count | 1.0 Count |

## Product Details

- **Brand:** Sierra
- **Controller Type:** Touch
- **Model Name:** Sierra 18-3569 Thermostat Kit
- **Product Dimensions:** 5"D x 8.9"W x 5"H
- **Special Feature:** Adjustable

## Images

![International 18-3569 Marine Thermostat Kit for Mercury/Mariner Outboard Motor - Image 1](https://m.media-amazon.com/images/I/41ZZX++BQvL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good part decent price
*by K***. on December 4, 2025*

Fit and worked well

### ⭐⭐⭐⭐⭐ Perfect fit
*by A***E on January 23, 2026*

Fit perfect on 1996 mercury 115 2 stroke.

### ⭐⭐⭐⭐⭐ Boat
*by A***. on December 17, 2024*

Worked well for what my husband needed it for fits just right

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**Shop now:** [https://www.desertcart.vu/products/10320742-international-18-3569-marine-thermostat-kit-for-mercury-mariner-outboard](https://www.desertcart.vu/products/10320742-international-18-3569-marine-thermostat-kit-for-mercury-mariner-outboard)

---

*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-05-09*