Fortpro Cylinder Liner O-Rings are the ultimate solution for maintaining the integrity and performance of your Cummins 855 and N14 engines. These O-rings are precision engineered to provide a tight seal that prevents oil leaks, ensuring your engine runs efficiently and safely. Made from heat and chemical resistant materials, these O-rings ensure exceptional durability and long life, even in the most extreme conditions. Compatible with OEM references AR51477 and 121201, their installation is simple and guarantees a perfect fit, protecting the engine from major problems and improving general efficiency.








