---
product_id: 85922725
title: "Quicksilver 79953Q04 Lower Unit Gear Lube Drain and Fill Hole Screw and Seal"
brand: "quicksilver"
price: "€ 15.32"
currency: EUR
in_stock: true
reviews_count: 13
category: "Quicksilver"
url: https://www.desertcart.nl/products/85922725-quicksilver-79953q04-lower-unit-gear-lube-drain-and-fill-hole
store_origin: NL
region: Netherlands
---

# Leak-proof seal technology OEM-grade precision fit Compatible with MerCruiser & Mercury Quicksilver 79953Q04 Lower Unit Gear Lube Drain and Fill Hole Screw and Seal

**Brand:** quicksilver
**Price:** € 15.32
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal the deal with Quicksilver – don’t let leaks sink your summer!

## Quick Answers

- **What is this?** Quicksilver 79953Q04 Lower Unit Gear Lube Drain and Fill Hole Screw and Seal by quicksilver
- **How much does it cost?** € 15.32 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/85922725-quicksilver-79953q04-lower-unit-gear-lube-drain-and-fill-hole)

## Best For

- quicksilver enthusiasts

## Why This Product

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

## Key Features

- • **Leak-Proof Seal:** Advanced sealing prevents gear lube leaks and water intrusion, protecting your engine’s heart.
- • **Durability Tested:** Built to withstand harsh marine environments, ensuring long-lasting reliability season after season.
- • **Precision OEM Fit:** Engineered to meet Mercury Marine specs for flawless compatibility and performance.
- • **Trusted Brand Legacy:** Quicksilver’s 65+ years of marine expertise means you’re investing in proven quality and peace of mind.
- • **Universal Compatibility:** Designed for all MerCruiser sterndrives and Mercury/Mariner outboards (except Verado).

## Overview

The Quicksilver 79953Q04 Lower Unit Gear Lube Drain and Fill Hole Screw and Seal is an OEM-quality replacement part designed to perfectly fit MerCruiser sterndrives and Mercury/Mariner outboards (excluding Verado). It ensures a secure seal to prevent gear lube leaks and water ingress, protecting your lower unit from costly damage. Backed by over 65 years of marine industry leadership, this durable component guarantees reliable performance and peace of mind for serious boaters.

## Description

Lower Unit Gear Lube Drain and Fill Hole Screw and Seal 79953Q04 is used with 3/8 - 16 drain/fill hole screw on all MerCruiser sterndrives, Mercury and Mariner outboards except the Verado series. It is very important to use the seal to make sure the drain/fill hole screw seats properly to retain the gear lube in the gear case and keep damage causing water out of the gear case. The Quicksilver brand is the leader in delivering uncompromising engine oils, parts and accessories to the marine industry for over 65 years. Quicksilver is the premier supplier of Mercury Marine Original Equipment replacement engine parts, oils, and accessories, but also works to serve all Original Equipment brands in the marine and powersports industries. It has earned a loyal following by providing the highest quality products that are tested through some of the most rigorous environments and testing procedures. No aftermarket company comes close to the level of research and design as Quicksilver; buying Quicksilver is buying performance, protection and peace of mind.

Review: Fit Perfect On Mercury Optimax 250xs - Old screw had bad o ring and was leaking out the vent hole. When I drained gear oil last fall it was milky. Added new gear oil and drove boat all summer this year and when I drained gear lube it was perfect.
Review: MerCruiser replacement part - OEM quality MerCruiser Alpha 1 Gen 1 replacement part.

## Features

- Used with 3/8 - 16 drain and fill hole screw on all MerCruiser sterndrives, Mercury and Mariner outboards except the Verado series
- Must use this seal to properly seat the drain/fill hole screw in the lower unit
- Helps prevent gear lube from leaking out and water from seeping in to the gear case causing serious damage
- Produced to meet Mercury Marine original equipment manufacturer specifications to maximize the performance of your Mercury and Mariner outboard or MerCruiser sterndrive

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0006JJ5LA |
| Best Sellers Rank | #446,714 in Automotive ( See Top 100 in Automotive ) #893 in Automotive Replacement Engine Oil Drain Plugs |
| Brand Name | Quicksilver |
| Color | Unspecified |
| Customer Reviews | 4.8 4.8 out of 5 stars (439) |
| Date First Available | February 18, 2010 |
| Fishing Technique | Spinning, Casting |
| Included Components | a drain plug screw, a drain plug seal |
| Item Dimensions LxWxH | 5 x 2 x 1.62 inches |
| Item Package Dimensions L x W x H | 3.9 x 2.4 x 1 inches |
| Item Weight | 0.01 Pounds |
| Manufacturer | Quicksilver |
| Material | Various Materials |
| Model Name | 79953Q04 Lower Unit Gear Lube Drain and Fill Hole Screw And Seal |
| Number of Items | 2 |
| Package Weight | 0.01 Kilograms |
| Part Number | 79953Q04 |
| Size | Unspecified |
| Suggested Users | Boat Engine Parts and Accessories |

## Images

![Quicksilver 79953Q04 Lower Unit Gear Lube Drain and Fill Hole Screw and Seal - Image 1](https://m.media-amazon.com/images/I/71DocD--CUL.jpg)
![Quicksilver 79953Q04 Lower Unit Gear Lube Drain and Fill Hole Screw and Seal - Image 2](https://m.media-amazon.com/images/I/81R+PjT0HQL.jpg)
![Quicksilver 79953Q04 Lower Unit Gear Lube Drain and Fill Hole Screw and Seal - Image 3](https://m.media-amazon.com/images/I/81cbGmXMVzL.jpg)
![Quicksilver 79953Q04 Lower Unit Gear Lube Drain and Fill Hole Screw and Seal - Image 4](https://m.media-amazon.com/images/I/81odtY8k6pL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Fit Perfect On Mercury Optimax 250xs
*by A***E on October 8, 2022*

Old screw had bad o ring and was leaking out the vent hole. When I drained gear oil last fall it was milky. Added new gear oil and drove boat all summer this year and when I drained gear lube it was perfect.

### ⭐⭐⭐⭐⭐ MerCruiser replacement part
*by L***N on July 19, 2025*

OEM quality MerCruiser Alpha 1 Gen 1 replacement part.

### ⭐⭐⭐⭐⭐ Works well and holds up in Chesapeake brackish water
*by R***. on October 24, 2019*

Worked well, no leaks and used all season. Used on my 125Hp Mercury EXLPTO lower unit by SEI. Definitely recommended to replace at least every other season.

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-02-18*