---
product_id: 10320742
title: "Sierra International 18-3569 Marine Thermostat Kit for Mercury/Mariner Outboard Motor"
brand: "sierra"
price: "VT13271"
currency: VUV
in_stock: true
reviews_count: 12
category: "Sierra"
url: https://www.desertcart.vu/products/10320742-sierra-international-18-3569-marine-thermostat-kit-for-mercury-mariner
store_origin: VU
region: Vanuatu
---

# Includes gasket & cover gasket for seamless install Fits 70-125 HP Mercury/Mariner 2-cycle outboards Precise 120°F temperature rating Sierra International 18-3569 Marine Thermostat Kit for Mercury/Mariner Outboard Motor

**Brand:** sierra
**Price:** VT13271
**Availability:** ✅ In Stock

## Summary

> 🌊 Keep your engine cool and your adventures hotter!

## Quick Answers

- **What is this?** Sierra International 18-3569 Marine Thermostat Kit for Mercury/Mariner Outboard Motor by sierra
- **How much does it cost?** VT13271 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-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

- • **Adjustable & Durable:** Crafted from premium metal with adjustable features to fine-tune your engine’s cooling system with confidence.
- • **OEM-Quality Assurance:** Meets or exceeds original equipment standards, delivering reliable durability and peace of mind on the water.
- • **Perfect Fit for Power:** Engineered for Mercury/Mariner 70-125 HP 2-cycle outboards (1987+), ensuring flawless compatibility and peak performance.
- • **Complete Installation Kit:** Includes thermostat, gasket, and cover gasket—everything you need for a hassle-free upgrade or replacement.
- • **Optimal Temperature Control:** Maintains a steady 120°F to protect your engine from overheating 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 and newer). Featuring a 120°F temperature rating and including all necessary gaskets, this kit ensures optimal engine temperature regulation and easy installation. Built to meet or exceed OEM standards, it guarantees reliable performance and durability for marine enthusiasts who demand the best.

## 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: Boat - Worked well for what my husband needed it for fits just right
Review: Good part decent price - Fit and worked well

## Features

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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000N9NXLG |
| Backlight | No |
| Best Sellers Rank | #769,879 in Automotive ( See Top 100 in Automotive ) #1,499 in Automotive Replacement Engine Thermostats |
| Brand | 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 (150) |
| Date First Available | February 6, 2007 |
| Display Type | touchscreen |
| Exterior | Machined |
| Global Trade Identification Number | 00808282112899 |
| Included Components | Sierra 18-3569 Thermostat Kit |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1.28 ounces |
| Item model number | 18-3569 |
| Lift Type | MOTOR |
| Manufacturer | Sierra |
| Manufacturer Part Number | 183569 |
| Material | Metal |
| Model Name | Sierra 18-3569 Thermostat Kit |
| Mounting Type | Bracket Mount |
| OEM Part Number | MERCURY MARINE 803061T1 |
| Power Source | Battery Powered |
| Product Dimensions | 5"D x 8.9"W x 5"H |
| Special Feature | Adjustable |
| Special Features | Adjustable |
| Specific Uses For Product | Marine Outboard Motor Control |
| Style | Classic |
| Temperature Control Type | Thermostatic |
| UPC | 808282112899 |

## 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)

## Customer Reviews

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

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

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

Fit and worked well

### ⭐⭐⭐⭐⭐ This is a perfect OEM Thermostat kit for my 1998 Mercury 115
*by T***. on August 13, 2024*

This is a perfect OEM Thermostat kit for my 1998 Mercury 115

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

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

---

*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-01-22*