---
product_id: 10320742
title: "Sierra International 18-3569 Marine Thermostat Kit for Mercury/Mariner Outboard Motor"
brand: "sierra"
price: "¥8686"
currency: JPY
in_stock: true
category: "Sierra"
url: https://www.desertcart.jp/products/10320742-sierra-international-18-3569-marine-thermostat-kit-for-mercury-mariner
store_origin: JP
region: Japan
---

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

**Brand:** sierra
**Price:** ¥8686
**Availability:** ✅ In Stock

## Summary

> 🌊 Keep your outboard cool and cruising with precision power!

## Quick Answers

- **What is this?** Sierra International 18-3569 Marine Thermostat Kit for Mercury/Mariner Outboard Motor by sierra
- **How much does it cost?** ¥8686 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/10320742-sierra-international-18-3569-marine-thermostat-kit-for-mercury-mariner)

## 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 plus two essential gaskets for hassle-free installation and reliable sealing.
- • **OEM-Grade Quality:** Meets or exceeds original equipment standards for trusted durability and performance.
- • **Adjustable & Reliable:** Thermostatic control with adjustable features to keep your marine engine running cool under pressure.
- • **Seamless Compatibility:** Designed for Mercury/Mariner 70-125 HP 2-cycle outboards (1987+), ensuring perfect fit and function.
- • **Precision Temperature Control:** Maintains optimal 120°F engine temp for peak performance and longevity.

## Overview

The Sierra International 18-3569 Marine Thermostat Kit is a premium replacement part engineered for Mercury/Mariner 70-125 HP 2-cycle outboard motors from 1987 onward. Featuring a precise 120°F temperature rating, this kit includes the thermostat and two gaskets for a complete, OEM-quality installation that ensures optimal engine temperature regulation and reliable performance on the water.

## 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.

## 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 |
| Best Sellers Rank | #898,356 in Automotive ( See Top 100 in Automotive ) #1,694 in Automotive Replacement Engine Thermostats |
| Brand | Sierra |
| 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 | 4.6 out of 5 stars 160 Reviews |
| 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 | 1.28 ounces |
| Manufacturer | Sierra |
| Manufacturer Part Number | 183569 |
| Manufacturer Warranty Description | Limited warranty. |
| Material Type | Metal |
| Model Name | Sierra 18-3569 Thermostat Kit |
| Model Number | 18-3569 |
| Mounting Type | Bracket Mount |
| Number of Items | 1 |
| Number of Packs | 1 |
| Power Source | Battery Powered |
| Product Dimensions | 5"D x 8.9"W x 5"H |
| Product Style | Classic |
| Special Feature | Adjustable |
| Specific Uses For Product | Marine Outboard Motor Control |
| Temperature Control Type | Thermostatic |
| UPC | 808282112899 |
| Unit Count | 1 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

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

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

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-10-30*