---
product_id: 3992963
title: "Grease Gun Coupler locks onto Zerk fittings. Grease goes in, not on the machine. World's best-selling original locking grease coupler. Rated 10,000 PSI. Long-lasting rebuildable tool."
brand: "locknlube"
price: "$76.28"
currency: USD
in_stock: true
category: "Lock N Lube"
url: https://www.desertcart.us/products/3992963-grease-gun-coupler-locks-onto-zerk-fittings-grease-goes-in
store_origin: US
region: United States of America
---

# Rated up to 10,000 PSI pressure Locks securely on Zerk fittings Rebuildable with spare kit included Grease Gun Coupler locks onto Zerk fittings. Grease goes in, not on the machine. World's best-selling original locking grease coupler. Rated 10,000 PSI. Long-lasting rebuildable tool.

**Brand:** locknlube
**Price:** $76.28
**Availability:** ✅ In Stock

## Summary

> 🔒 Lock it tight, grease it right—never miss a beat on maintenance!

## Quick Answers

- **What is this?** Grease Gun Coupler locks onto Zerk fittings. Grease goes in, not on the machine. World's best-selling original locking grease coupler. Rated 10,000 PSI. Long-lasting rebuildable tool. by locknlube
- **How much does it cost?** $76.28 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/3992963-grease-gun-coupler-locks-onto-zerk-fittings-grease-goes-in)

## Best For

- locknlube enthusiasts

## Why This Product

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

## Key Features

- • **Universal Compatibility:** Fits all 1/8" NPT grease guns—manual, pneumatic, or battery-powered—for seamless upgrades.
- • **Lock & Load with Confidence:** Patented locking jaws keep the coupler firmly attached—no more grease spills or fumbling hands.
- • **Built to Last, Built to Rebuild:** Includes a spare rebuild kit, doubling your value and extending tool life effortlessly.
- • **Precision Fit for Every Machine:** Works flawlessly on all SAE & metric Zerk fittings with a full range of adapters.
- • **Effortless Operation Under Pressure:** Thumb lever design allows quick attach and release, even when grease lines are pressurized.

## Overview

The LockNLube Grease Gun Coupler is the world’s best-selling original locking coupler, engineered to securely lock onto all Zerk fittings and rated for up to 10,000 PSI. Designed for professionals who demand precision and durability, it features a patented locking mechanism, universal 1/8" NPT compatibility, and comes with a spare rebuild kit for extended use. This tool ensures grease goes exactly where it should—inside your machinery, not on it—making maintenance faster, cleaner, and more efficient.

## Description

Buy LockNLube Grease Gun Coupler locks onto Zerk fittings. Grease goes in, not on the machine. World's best-selling original locking grease coupler. Rated 10,000 PSI. Long-lasting rebuildable tool.: Grease Guns - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

## Features

- LOCKS ON, STAYS ON, WON'T LEAK—LIKE HAVING AN EXTRA HAND! No need to hold the coupler in place while trying to grease your machinery. The LockNLube Grease Coupler locks on tight and lets you use both hands on your grease gun.
- THE ONLY REBUILDABLE LOCKING COUPLER: We include a spare rebuild kit! It's like getting two couplers for the price of one.
- 1/8" NPT COMPATIBLE WITH ALL GREASE GUNS - BATTERY, PNEUMATIC, MANUAL: Whether you are using Grandpa’s old Alemite lever grease gun, or the latest battery or pneumatic grease guns, the LockNLube Grease Coupler can be added to upgrade your grease gun.
- WORKS ON ALL ZERK FITTINGS, SAE & METRIC with a full lineup of adapters to reach any grease fighting on any machine!
- EASY TO USE: Press the thumb lever to open the LockNLube’s patented jaws and attach to the Zerk. Release the thumb lever and the LockNLube locks on tight! Press the thumb lever again to easily release from the Zerk, even under pressure!
- RATED UP TO 10,000 PSI
- BEST BUILT GUARANTEE: The LockNLube Grease Coupler is covered by our unconditional 1-year warranty

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00H7LPKKU |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #380 in Automotive ( See Top 100 in Automotive ) #4 in Fuel Transfer & Lubrication Products |
| Color | Silver |
| Customer Reviews | 4.7 4.7 out of 5 stars (32,090) |
| Date First Available | December 9, 2013 |
| Included Components | Just the item |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 4 ounces |
| Item model number | 1/8\\\" NPT |
| Manufacturer | LockNLube |
| Material | Metal |
| Maximum Pressure | 10000 Pound per Square Inch |
| Part Number | GC81011 |
| Product Dimensions | 3.45 x 0.63 x 1.66 inches |
| Size | NPT With Spare Rebuild Kit |
| Warranty Description | 1-Year Warranty |

## Product Details

- **Brand:** LockNLube
- **Global Trade Identification Number:** 00810102950260
- **Item dimensions L x W x H:** 3.45 x 0.63 x 1.66 inches
- **Manufacturer:** LockNLube
- **Material:** Steel, Rubber
- **Maximum Operating Pressure:** 10000 Pound per Square Inch
- **Number of Ports:** 2
- **UPC:** 810102950260

## Images

![Grease Gun Coupler locks onto Zerk fittings. Grease goes in, not on the machine. World's best-selling original locking grease coupler. Rated 10,000 PSI. Long-lasting rebuildable tool. - Image 1](https://m.media-amazon.com/images/I/71AOumYncbL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: Does this work with Milwaukee grease guns?**
A: This does not work on the older Milwaukee m18 grease guns. They used a metric threaded hose on the older ones. The newer guns have standard thread and it will fit those. Take the current connector off the end of your grease gun hose. If the first 1/8 inch of the hose is not threaded, then you have a metric hose and this lock lune will not fit.

**Q: Where is this product manufactured?**
A: It is a quality product made in South Africa by Gurtech.

**Q: After installing it, I couldn't depress the gun's pump. What did I do wrong?**
A: Between myself and friends we have successfully installed five of these fittings without any problems. As per the other reviews, I would first check your gun to see if was in fact pumping grease, then reinstall the coupler and try again, before you put it on a fitting. Could be that the fitting jerk that you tried it on was frozen. If it still does not allow grease to flow, it is defective and you will need to return it.

**Q: It is just the fitting or does it include the flexible line?**
A: It is just the fitting. The hose was included to give context and sense of scale.

## Frequently Bought Together

- LockNLube Grease Gun Coupler locks onto Zerk fittings. Grease goes in, not on the machine. World's best-selling original locking grease coupler. Rated 10,000 PSI. Long-lasting rebuildable tool.
- LockNLube 90 Degree Grease Coupler Adapter
- LockNLube Pressure Return Valve for Use with Cordless Grease Guns. No More Pressure Locks! Returns Grease to The Tube. Releases Hose backpressure.

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-07-15*