The Husqvarna 576596501 Leaf Blower/Vacuum Piston is a replacement engine piston designed to help restore reliable compression and consistent engine performance in compatible leaf blower and vacuum models. It works by moving within the engine cylinder to compress the fuel-air mixture and transfer combustion force to the crankshaft, enabling efficient engine operation. Replacing a worn... https://www.wholetoolbox.com/husqvarna-576596501-leaf-blower-vacuum-piston