Flywheel Nut, Animal Item Number: 591988 Price: $3.93 Add to Cart Description The 591988 is an OEM metric nut for the flywheel on the Briggs Animal Engine. Weight: 0.0425 Volume: 0.2888 Accessories PVL Flywheel, Animal Flywheel Fan, 2 Bolt Holes, Animal Crankshaft, Animal, World Formula