---
product_id: 8437954
title: "MERCRUISER ALPHA ONE UPPER BOX GEARCASE SEAL KIT | GLM Part Number: 87500; Sierra Part Number: 18-2648; Mercury Part Number: 26-32511A1"
brand: "glm"
price: "R1347"
currency: ZAR
in_stock: true
reviews_count: 4
url: https://www.desertcart.co.za/products/8437954-mercruiser-alpha-one-upper-box-gearcase-seal-kit-glm-part
store_origin: ZA
region: South Africa
---

# Precision Engineering Durable Components Easy Installation MERCRUISER ALPHA ONE UPPER BOX GEARCASE SEAL KIT | GLM Part Number: 87500; Sierra Part Number: 18-2648; Mercury Part Number: 26-32511A1

**Brand:** glm
**Price:** R1347
**Availability:** ✅ In Stock

## Summary

> 🚤 Seal the Deal with Confidence!

## Quick Answers

- **What is this?** MERCRUISER ALPHA ONE UPPER BOX GEARCASE SEAL KIT | GLM Part Number: 87500; Sierra Part Number: 18-2648; Mercury Part Number: 26-32511A1 by glm
- **How much does it cost?** R1347 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/8437954-mercruiser-alpha-one-upper-box-gearcase-seal-kit-glm-part)

## Best For

- glm enthusiasts

## Why This Product

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

## Key Features

- • **Robust Durability:** Engineered to withstand harsh marine environments.
- • **Seamless Compatibility:** Designed for GLM, Sierra, and Mercury models.
- • **Cost-Effective Maintenance:** Save on repairs with this essential kit.
- • **User-Friendly Installation:** Get back on the water quickly with straightforward setup.
- • **Comprehensive Seal Protection:** Prevents leaks and enhances gearcase longevity.

## Overview

The MERCRUISER ALPHA ONE UPPER BOX GEARCASE SEAL KIT is a high-quality maintenance solution compatible with GLM, Sierra, and Mercury parts. This kit ensures robust protection against leaks, enhancing the durability and performance of your marine gearcase.

## Description

MERCRUISER ALPHA ONE UPPER BOX GEARCASE SEAL KIT | GLM Part Number: 87500; Sierra Part Number: 18-2648; Mercury Part Number: 26-32511A1

## Features

- GLM Part Number: 87500; Sierra Part Number: 18-2648; Mercury Part Number: 26-32511A1

## Images

![MERCRUISER ALPHA ONE UPPER BOX GEARCASE SEAL KIT | GLM Part Number: 87500; Sierra Part Number: 18-2648; Mercury Part Number: 26-32511A1 - Image 1](https://m.media-amazon.com/images/I/61Hl-PWgWWL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐ 







  
  
    As described.
  

*by N***I on Reviewed in the United States on October 6, 2019*

As described worked good for alpha one gen 2.

### ⭐⭐⭐⭐⭐ 







  
  
    Nice kit
  

*by T***. on Reviewed in the United States on May 18, 2016*

Good quality gasket kit at a great price. A schematic drawing added for reference would be nice, but still not a complaint as you should have a manual for torque values anyway.

### ⭐⭐⭐⭐ 







  
  
    Four Stars
  

*by R***. on Reviewed in the United States on September 22, 2015*

Worked well on my 120 HP I drive.

---

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**Shop now:** [https://www.desertcart.co.za/products/8437954-mercruiser-alpha-one-upper-box-gearcase-seal-kit-glm-part](https://www.desertcart.co.za/products/8437954-mercruiser-alpha-one-upper-box-gearcase-seal-kit-glm-part)

---

*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-03-06*