The BRIGGS & STRATTON 795858 Engine Piston Assembly helps convert combustion pressure into mechanical movement within the engine. Positioned inside the cylinder, the piston moves up and down as the engine operates and transfers force through the connecting rod to the crankshaft. Proper piston movement supports efficient combustion, smooth power transfer, and consistent engine performa... https://www.wholetoolbox.com/briggs-stratton-795858-engine-piston-assembly/795858.html