Fuel Regulator Valve 23535129 for Detroit Diesel Series 60 Engines 14L. Part Type:Fuel Check Valve. 1 PC Check Valve for Detroit Diesel Series 60 14L. Direct Replacement For Detroit Diesel 23535129 Fuel Check Valve. Use on Detroit Diesel Series 60. Thread: M14x1.5 Male X 5/8-18 male pipe. Total length is 3.79in. Detroit Diesel Series 60 Engines 14L. · Please read the item description and check the pictures carefully before ordering.