CATEGORIES HOME Oil Drain Plug, Flathead Item Number: 691686 Price: $3.54 Add to Cart Description This product is an OEM Briggs oill drain plug. It fits flathead and animal engines. Specs Thread:1/4 x 18 NPTF Accessories Oil Fill Cap, Flathead FH PLUG-OIL FILL TOP CRANKCASE Plug Oil Drain, Flathead, Animal, LO206