Looking to boost your Husqvarna chainsaw's power? This pop-up piston kit is a popular performance upgrade for models like the 555, 560, and 562XP! It's a 46mm piston assembly that replaces OEM part number 5052155502, designed to increase compression and give your saw more punch in the cut. From PERFORMANCE SAW SUPPLY, this aftermarket kit is brand new and includes everything you need (assembly required). Perfect for professional loggers, serious firewood cutters, or anyone who wants to get maximum performance from their Husqvarna. A pop-up piston can really wake up these saws, making them cut faster and stronger through tough wood. Important: This is for gasoline 2-stroke engines, and please note the California Prop 65 warning about chemicals. Installation requires mechanical skill and knowledge of chainsaw engines - not for beginners. But if you're comfortable rebuilding a top end, this kit delivers noticeable gains. Whether you're refreshing a worn saw or building a hot saw for competition, this piston kit is a key component. Unleash the full potential of your Husqvarna and feel the difference in cutting power. Get ready to impress with how much faster your saw works!