Incorporating Fumoto's most compact ball valve, Fumoto's F series valves are designed to fit cars, light trucks, vans, and select commercial engines. Constructed of forged brass and stainless steel to exacting Japanese specifications, F-series valves are designed to provide a lifetime of dependable and reliable service.The size of engine oil drain valve is 14 millimeters - 1.25. The Ford Powerstroke engines and some Jeep models commonly use the F-111 valve. Used to drain engine oil with the touch of a finger and eliminates stripped threads. It replaces drain plug for a quick, easy, clean oil change. It is also ideal for drawing a small sample of oil for oil analysis. Helps to avoid contact with hot oil and prevents hands and clothes from getting messed up. NOTE: The FN series are NOT RECOMMENDED for engines with low ground clearance.