Model 2178-D1 is designed to fit Demco Cast raised trigger latch couplers (as seen in the FINE PRINT section). This model was manufactured with a formed carbon steel outer housing to completely encapsulate the coupler head and latch. This lock model will be able to secure most safety chains up to 3/8" in the dedicated chain locking compartment.
If you have a 2" Demco Stamped Coupler, please see Model 2178-D .
Designing the best coupler locks is not an easy task. We pride ourselves on producing a "glove like" fit coupler lock. Rest assured that Proven Industries trailer lock products will leave you with simply the best coupler lock on the market. In addition, no other trailer coupler locks can secure your safety chains.
*Please note, product pictures may not represent current model, as products are revised. All locks are now upgraded to 7 pin tubular lock at no additional cost.
Cobra 7 (Standard Aluminum)
The Cobra 7 is a patented key system that was developed for the high-security needs in the vending industries. The COBRA tubular keyway is like no other with its 7 sided tubular keyway, this unique feature stops anyone from going to a hardware store to copy your key. This product offers a high-security solution for those that are looking for excellent exterior performance. COBRA 7 comes standard in all of our products at no additional cost.
The Cobra 7 system is geared for the business owner looking for a great performing lock system at an affordable price with key control.
Medeco M3 (Standard Stainless Steel)
Medeco comes as one of the oldest High-security lock manufacturers in the USA. You will find this high-security lock in most prisons, government facilities, and even the White House! This particular lock is virtually impossible to pick due to its rotating pins that not only need to be at the right height but the right rotation in order to unlock.
Medeco is typically needed for the high-security needs of companies that need key control or grandmaster key solutions. All parts are machined out of brass and hardened steel, for the combination of great exterior performance and high-security needs.
All orders placed before 2pm EST will ship the same day, in most cases. Please allow an additional 24 hours processing time on all orders that have specified to be "keyed-alike". Standard Flat Rate ($15.00) shipping option may be USPS or UPS (determined by shipper) and will carry a 2-6 day delivery time.
Besttrailerlocks.com promises to ship orders in the shipping manner chosen by the customer. Please be aware that ship times shown at check-out are estimated by UPS and/or USPS, not Besttrailerlocks.com and are not guaranteed. Besttrailerlocks.com does not guarantee delivery time - only shipping method chosen. Any discrepancies due to delivery time will need to be remedied with the specified carrier. Besttrailerlocks.com does not ship on Saturday or Sunday. All orders placed after 2pm EST on Friday will be shipped the following Monday (excluding holidays).
Warranty & Returns
Warranty & Returns
BestTrailerLocks.com will warrant products sold against any defect that affects form, fit, or function of the product for a period of 1 months from date of purchase.
BestTrailerLocks.com will not warranty any product from rust due to normal usage.
Only one promotion discount per order.
BestTrailerLocks.com only sells overstock, refurbished, cosmetically damaged and exchanged items.
All Returns/Exchanges are subject to a 10% Restocking Fee.
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If your order is placed before 2pm EST, we will ship it that day!
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