--- 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." price: "40471CFA" currency: XOF in_stock: true reviews_count: 13 url: https://www.desertcart.sn/products/3992963-grease-gun-coupler-locks-onto-zerk-fittings-grease-goes-in store_origin: SN region: Senegal --- # Rated up to 10,000 PSI pressure Locks tight on Zerk fittings Fully rebuildable with spare kit 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. **Price:** 40471CFA **Availability:** ✅ In Stock ## Summary > 🔧 Lock it, load it, and never lose a drop again! ## 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. - **How much does it cost?** 40471CFA with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/3992963-grease-gun-coupler-locks-onto-zerk-fittings-grease-goes-in) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Effortless On & Off:** Spring-loaded thumb lever makes locking and releasing easy—even under high pressure or recessed fittings. - • **Leak-Proof Precision:** Patented sliding sleeve ensures grease goes in, not on your machine—zero leaks guaranteed. - • **Built to Last & Rebuild:** Includes a spare rebuild kit, extending tool life and saving you replacement costs. - • **Universal Compatibility:** Fits all 1/8" NPT grease guns—manual, pneumatic, or battery-powered—for seamless upgrades. - • **Hands-Free Locking Power:** Locks on securely so you can grease with both hands free—no more mess or frustration. ## Overview The LockNLube Grease Gun Coupler is the world’s best-selling original locking coupler, engineered to lock tightly onto all Metric and SAE Zerk fittings. Rated to withstand pressures up to 10,000 PSI, it prevents leaks and grease waste while enabling hands-free operation. Compatible with all 1/8" NPT grease guns—manual, pneumatic, or battery-powered—this durable, steel-and-rubber tool includes a spare rebuild kit for extended service life and comes backed by a 1-year warranty. ## Description Product description The Original LockNLube Grease Coupler LOCKS ON, STAYS ON, HANDS-FREE: Grease goes in, not on, the machine. Easily disconnects, even under pressure. No more broken Zerks COMPATIBLE WITH ALL GREASE GUNS AND GREASE FITTINGS: Works with all grease guns and manufacturers . Locks on to all Metric and SAE specification Zerk fittings. The Original LockNLube Grease Coupler! hero-video Hands-free, no mess, and no wasted grease! The only fully rebuildable grease coupler, available with or without a rebuild kit. Rated to 10,000 PSI. Perfect for recessed fittings. Easily disconnects, even under pressure. No more broken Zerks. SPRING-LOADED THUMB LEVER Non-slip thumb lever opens and closed the jaws. No more broken Zerks. Easy on, easy off, even under pressure or on recessed fittings. SPRING-LOADED THUMB LEVER Non-slip thumb lever opens and closed the jaws. No more broken Zerks. Easy on, easy off, even under pressure or on recessed fittings. COMPATIBLE WITH ALL GREASE GUNS 1/8" NPT works with all grease guns and manufacturers – pneumatic, manual, or electric. COMPATIBLE WITH ALL GREASE GUNS 1/8" NPT works with all grease guns and manufacturers – pneumatic, manual, or electric. LOCKS ON, DOES NOT LEAK Grease goes in, not on the machine. LockNLube’s unique sliding sleeve ensures that when the jaws are locked onto the Zerk, a leak-proof seal is created. LOCKS ON, DOES NOT LEAK Grease goes in, not on the machine. LockNLube’s unique sliding sleeve ensures that when the jaws are locked onto the Zerk, a leak-proof seal is created. RATED TO 10,00 PSI. No matter what grease gun you use, the LockNLube Grease Coupler will not leak or pop off at any pressure up to 10,000 PSI. RATED TO 10,00 PSI. No matter what grease gun you use, the LockNLube Grease Coupler will not leak or pop off at any pressure up to 10,000 PSI. End greasing frustration with the original locking grease coupler! Locks on-Stays on-Won't leak Easily disconnects, even under pressure. No more broken Zerks. 1/8" NPT compatible with all grease guns - battery, pneumatic, manual. Includes a rebuild kit The only fully rebuildable grease coupler, available with or without a rebuild kit, extending service life and reducing replacement costs. Works on all Zerk fittings Patented Locking Technology (US Patent #8955544) means grease goes in, not on, the machine! Available in an XL Version The LockNLube Grease Couler XL (GC81042) has a 2" longer barrel for those deeply recessed fittings! Key Specs Review: The locking mechanism is solid - This LockNLube Grease Gun Coupler is a total game changer. If you’ve ever struggled with traditional couplers popping off, leaking grease everywhere, or just being frustrating to use—this completely solves those problems. The locking mechanism is solid and holds tight on the Zerk fitting, even under pressure. No more grease spraying or wasting product. Once it’s locked in, it stays put, and releasing it is just as easy. Build quality feels very durable and well-made. You can tell it’s designed for real use, not just light-duty tasks. I’ve used it on multiple machines and it performs flawlessly every time. It also saves a lot of time and mess, which honestly makes the whole greasing process way less annoying. Highly recommend for anyone who uses a grease gun regularly—definitely worth the upgrade. Review: Best Upgrade I’ve Ever Made to My Grease Gun - The LockNLube grease gun coupler is one of those tools you don’t realize you desperately needed until you use it. Absolute game changer. No more fighting with stubborn zerks, no more grease leaking everywhere, and no more hands covered in grease trying to hold the coupler on. This thing locks on tight and stays put. The build quality is outstanding — heavy-duty, solid, and clearly built to last. It grips fittings perfectly and releases easily when you’re done. I’ve used it on everything from tractors and trailers to lawn equipment and vehicles, and it works flawlessly every time. Honestly, it saves so much frustration and wasted grease that it paid for itself almost immediately. If you own greaseable equipment and are still using a standard coupler, stop wasting your time and upgrade. This is one of those rare tools that actually exceeds the hype. ## 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 | #299 in Automotive ( See Top 100 in Automotive ) #4 in Fuel Transfer & Lubrication Products | | Customer Reviews | 4.7 4.7 out of 5 stars (31,967) | | 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 | Steel, Rubber | | 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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ The locking mechanism is solid *by C***O on March 29, 2026* This LockNLube Grease Gun Coupler is a total game changer. If you’ve ever struggled with traditional couplers popping off, leaking grease everywhere, or just being frustrating to use—this completely solves those problems. The locking mechanism is solid and holds tight on the Zerk fitting, even under pressure. No more grease spraying or wasting product. Once it’s locked in, it stays put, and releasing it is just as easy. Build quality feels very durable and well-made. You can tell it’s designed for real use, not just light-duty tasks. I’ve used it on multiple machines and it performs flawlessly every time. It also saves a lot of time and mess, which honestly makes the whole greasing process way less annoying. Highly recommend for anyone who uses a grease gun regularly—definitely worth the upgrade. ### ⭐⭐⭐⭐⭐ Best Upgrade I’ve Ever Made to My Grease Gun *by M***L on May 15, 2026* The LockNLube grease gun coupler is one of those tools you don’t realize you desperately needed until you use it. Absolute game changer. No more fighting with stubborn zerks, no more grease leaking everywhere, and no more hands covered in grease trying to hold the coupler on. This thing locks on tight and stays put. The build quality is outstanding — heavy-duty, solid, and clearly built to last. It grips fittings perfectly and releases easily when you’re done. I’ve used it on everything from tractors and trailers to lawn equipment and vehicles, and it works flawlessly every time. Honestly, it saves so much frustration and wasted grease that it paid for itself almost immediately. If you own greaseable equipment and are still using a standard coupler, stop wasting your time and upgrade. This is one of those rare tools that actually exceeds the hype. ### ⭐⭐⭐⭐⭐ Secure, Clean, and Worth It *by N***H on February 21, 2026* This grease coupler works extremely well. It provides a very secure, tight hold on grease zerk fittings, which allows for better grease transfer and significantly less mess compared to standard couplers. The spring in the coupler feels strong and well-built, giving you confidence that it won’t pop off under pressure. It is slightly longer and a bit bulkier than the original couplers that come on most grease guns (both electric and manual), but that actually works in its favor. In tight spots where you can’t wiggle or twist the coupler to disconnect it, this one saves a lot of frustration. No more yanking on the hose or fighting to get it off the fitting. When I bought this coupler, I also picked up the LockNLube 8-Piece Quick Connect Greasing Accessory Kit, knowing clearance might be an issue in some areas—and I don’t regret that decision at all. The combination works great and makes greasing much easier overall. I’m very satisfied with this purchase and would absolutely recommend this grease coupler to anyone who does regular maintenance and wants a cleaner, easier experience. ## 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. --- ## 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.sn/products/3992963-grease-gun-coupler-locks-onto-zerk-fittings-grease-goes-in](https://www.desertcart.sn/products/3992963-grease-gun-coupler-locks-onto-zerk-fittings-grease-goes-in) --- *Product available on Desertcart Senegal* *Store origin: SN* *Last updated: 2026-06-21*