Description Model GRB-78 will fit your Ram or Bulldog gooseneck trailer coupler. Please refer to the coupler fit image above to confirm that you have a Ram or Bulldog gooseneck coupler. **Please note that this lock is not compatible with the Bulldog BX1 coupler. Please see our other options or contact our customer service team if you need help identifying which product to purchase. 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. Fine Print Gooseneck Trailer coupler lock model GR may not fit all trailer couplers. Please look at trailer coupler lock index pictures. This lock will not fit the Bulldog BX1 series couplers. *Please note, product pictures may not represent current model, as products are revised* Lock Core Cobra (Standard) The Cobra 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 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 comes standard in all of our products at no additional cost. Application The Cobra system is geared for the business owner looking for a great performing lock system at an affordable price with key control. Proven Disc-Detainer (Upgrade Option) The Proven Disc Detainer Lock was developed for high-security situations where minimum maintenance is not possible. This particular lock is virtually impossible to pick due to its rotating disk and requires special lock picks and skills needed in order to pick. Application Disc detainer locks are not all that common in everyday use. Mainly this style of lock is reserved for high-end locks. These lock perform well in extreme weather conditions with minimum if any maintenance. Medeco M3 (Available upon request, for additional cost) 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. Application 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. Abloy (Available upon request, for additional cost) Abloy cylinders provide high-security protection by using a unique rotating disc mechanism. Unlike standard locks, they are virtually unpickable, bump-proof, and designed to withstand harsh road conditions and outdoor environments without jamming. *Medeco and Abloy is available upon request for an additional fee. Please call customer support for additional information.
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