WIDE APPLICATION Our fuel system coupler fitting fits for Detroit Diesel S60, Cummins, Caterpillar, MBE900, and MBE4000 Engines QUICK CONNECTION This fuel system coupler fitting provides a quick, firm and safe connection to a "compu-check" quick-connect fitting, and used together with ONI581T J-47912 Detroit Diesel S60 MBE 900 MBE 4000 DD13 DD15 FUEL SYSTEM PRIMING PUMP 5869 Alternative. DIRECT REPLACEMENT thread size 1/4" NPT male, Hex size 13/16". Directly replace for OTC 5869-1 and for Kent-Moore J-47912-QC 5869-1. The ultimate solution for efficient and effective fuel system priming. .