--- product_id: 266903180 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: "€ 87.20" currency: EUR in_stock: true reviews_count: 1 category: "Lock N Lube" url: https://www.desertcart.hr/products/266903180-grease-gun-coupler-locks-onto-zerk-fittings-grease-goes-in store_origin: HR region: Croatia --- # Rated up to 10,000 PSI pressure Locks securely on Zerk fittings Includes spare rebuild kit for longevity 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:** € 87.20 **Availability:** ✅ In Stock ## Summary > 🔧 Lock it, load it, and never look back—grease like a pro with LockNLube! ## 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?** € 87.20 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/266903180-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 - • **Mess-Free Precision:** Locks tightly on all SAE & metric Zerk fittings, eliminating grease waste and machine mess. - • **Universal Compatibility:** Fits all 1/8" NPT grease guns—manual, pneumatic, or battery-powered—for seamless upgrades. - • **Lock & Load with Confidence:** Patented locking mechanism ensures a leak-proof, hands-free grease application every time. - • **Built to Last, Rebuilt to Save:** Comes with a spare rebuild kit, doubling your tool’s lifespan and value. - • **Effortless Release Under Pressure:** Thumb lever design lets you detach easily even from pressurized or recessed fittings. ## Overview The LockNLube Grease Gun Coupler is the world’s best-selling original locking coupler, engineered to lock securely onto all Zerk fittings and rated for pressures up to 10,000 PSI. Its patented sliding sleeve mechanism provides a leak-proof seal that frees both hands for efficient greasing. Compatible with all 1/8" NPT grease guns—manual, pneumatic, or battery-powered—it includes a spare rebuild kit for extended durability and easy maintenance. Trusted by professionals worldwide, it eliminates mess and frustration, making routine machine lubrication faster, cleaner, and more reliable. ## Description Just imagine if greasing your machine could be easier. Less painful and less frustrating. That's what you get with the Lock and Lube grease coupler. With its patented sliding sleeve locking mechanism, the coupler locks on and creates a leak-proof seal. The waste and the mess are gone! If a fitting becomes pressurized, especially a recessed one, just depress the thumb lever and release the coupler. No more fighting and struggling with stuck-on couplers. No more broken-off fittings. For those of you who prefer lever guns, once the Lock and Lube coupler is locked on, both hands are free to pump the grease. With an 1/8" NPT connection, works with all standard grease guns: electric, pneumatic or hand-operated. When frustration and aggravation END, so does greasing procrastination! Your machines will get the grease they so desperately need when they need it. The Lock and Lube grease coupler WILL CHANGE your life! Now available standard with a replaceable Seal Kit (extra seal + 4 hardened steel jaws). With this extra seal, the LockNLube coupler achieves multi-year service life. A spare Seal Kit is included with each coupler - so when the existing durable nitrile rubber seal reaches it's service life or is damaged by a burred zerk, you simply change out the seal. Additional Seal Kits are also available. Review: Recommended - The best lube piece you need to have. Good quality and recommend to buy. ## 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 | | Best Sellers Rank | #2,430 in Automotive ( See Top 100 in Automotive ) #5 in Automotive Fuel Transfer & Lubrication | | Brand | LockNLube | | Brand Name | LockNLube | | Connector Type | Threaded | | Country of Publication | South Africa | | Customer Reviews | 4.7 out of 5 stars 30,582 Reviews | | Exterior Finish | Uncoated Metal | | Exterior finish | Uncoated Metal | | Global Trade Identification Number | 00810102950260 | | Included Components | Just the item | | Inlet Connection Size | 5 Millimeters | | Inlet Connection Type | National Pipe Tapered | | Inlet connection size | 5 Millimeters | | Inlet connection type | National Pipe Tapered | | Item Dimensions | 8.8 x 1.6 x 4.2 centimeters | | Item Weight | 0.25 Pounds | | Item dimensions L x W x H | 8.8 x 1.6 x 4.2 centimeters | | Manufacturer | LockNLube | | Material | Metal | | Material Type | Metal | | Maximum Pressure | 10000 Pound per Square Inch | | Model Number | 1/8\\\" NPT | | Number of Ports | 2 | | Outlet Connection Size | 0.13 Inches | | Outlet Connection Type | NPT | | Size | NPT With Spare Rebuild Kit | | Specification Met | USPTO | | Thread Size | 1/8" NPT | | Thread Type | NPT | | UPC | 810102950260 | | Valve Type | Coupler | ## Product Details - **Brand:** LockNLube - **Exterior finish:** Uncoated Metal - **Inlet connection size:** 5 Millimeters - **Item dimensions L x W x H:** 8.8 x 1.6 x 4.2 centimeters - **Material:** Metal ## 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 ### ⭐⭐⭐⭐⭐ Recommended *by A***D on 4 August 2021* The best lube piece you need to have. Good quality and recommend to buy. ## 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.hr/products/266903180-grease-gun-coupler-locks-onto-zerk-fittings-grease-goes-in](https://www.desertcart.hr/products/266903180-grease-gun-coupler-locks-onto-zerk-fittings-grease-goes-in) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-04-26*