OTC's 6492-10 Oil Priming Adapter allows for proper engine pre-lubing, preventing dry starts after engine service. Adapter installs into the oil priming port in the oil module. For use with OTC's 6492 engine oil primer (not included) on Detroit Diesel DD13 and DD15 engines. Specifications: M33 X 2.0 threads; 1-1/16 inch (27mm) hex. Similar to J-49181. Made in the USA. Value is at the core of the OTC tool and equipment portfolio. Whether it's a simple repair or the most complex drivability concern, these award-winning tools universally solve problems faster, and at better value, than any other product line available. Whether it's a specialty tool or unique piece of service equipment, OTC provides top solutions to modern automotive service challenges while increasing technicians' productivity and shop profits.