Piston ring kit designed for Husqvarna 545, 545XP, 550, and 550XP chainsaw models. This replacement kit includes everything needed for piston assembly: one piston, one pin, one ring, and two snap rings.
Compatible with original part numbers 577 04 70 02 and 577 04 70-06. The 43mm sizing is matched to these specific Husqvarna models, ensuring proper fit and performance.
Before purchasing, verify that your chainsaw model matches one of the compatible versions listed. Check the original part number on your machine against the part numbers included in this kit to confirm compatibility.
This is a genuine replacement component suitable for maintenance and repair work on qualifying Husqvarna equipment.















