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Use this heavy-duty cast iron coupler lock to help prevent trailer towaway theft. Fits standard 2-5/16ball couplers with flat lips. Resists picking cutting drilling and freezing. Tumbler offers nearly 1 million possible key codes. Protect your trailer with the best coupler lock AMPLOCKs exclusive locks are the most durable and reliable on the market today. Our various models are mold to fit the specific shape of your trailer coupler when unhitched so your AMPLOCK lock is the perfect theft deterrent. Trailer coupler lock High Security Trailer Lock with Patented Mechanism Patented mechanism with our 2 parts lock Cylinder Lock location makes it difficult to access for thiefs Swivel design to prevent vehicle traction when locked Made of American USA materials Trailer coupler lock Heavy Duty Lock made of Stainless Steel and Ducted Cast Iron Mass of material of 12 pounds heavy that slow down all cutting type attempt Material absorb shock instead of breaking the lock will fold/bump after impact Resist to torch cut and liquid nitrogen Better corrosion resistance Ultimate Trailer Lock High Quality Cylinder Lock Unpickable cylinder lock Rotative face to prevent drilling Potential of millions of key combinations unique code for each customer Opportunity to have additionnal keys or lock keyed alike Trailer coupler lock 2 5/16” Trailer Coupler Lock Moulded to fit on these specific 2 5/16” trailer couplers only The perfect fit to decrease any hold that thiefs can use Tight fit that secure access to the coupler Perfect protection when trailer is unhitched Trailer Lock Easy Installation Push and Lock cylinder lock for an easy quick and effective use Mechanical lock Simple to use Additionnal treatment as e-coat and electrostatic paint Features: Tamper-resistant sturdy lock deters trailer theft by preventing hookup Fits over coupler engaging it like a trailer ball does and blocking the ball opening Prevents would-be thieves from hitching your trailer to their tow vehicle Push-and-lock cylinder locks without the need for a key Lock’s location on bottom makes it difficult for thieves to access Rotating-disc-tumbler lock provides maximum security Nearly a million possible key codes Resistant to picking and drilling Heavy-duty ductile cast iron construction Absorbs shock to prevent breaking Resists any kind of cutting including cutting with a torch or liquid nitrogen Molded fit with swivel design decreases hold options for thieves E-coat finish resists corrosion 2 Keys included Specs: Application: standard ball couplers for 2-5/16balls Coupler must have flat lip Maximum coupler width including lip: 4-9/16Maximum lip thickness: 7/16Great for use on couplers with the Demco composite EZ Latch A-frame couplers with thumb latches flat mount couplers and more. Coupler Fits: This lock fits 2-5/16ball couplers with a flat lip. Examples of some of the couplers it fits are pictured below. Secure Locking Mechanism This coupler lock has a disc tumbler locking mechanism. Unlike locks that use vulnerable spring-loaded pins this ultra-secure lock is bump-proof. The cylinder has a series of rotating discs that can be correctly lined up only when you turn the corresponding key. Two identical notched keys are included to operate the lock. Because these keys feature 1 of nearly a million possible key codes it’s extremely unlikely that another individual will have a key that can open this lock.