Description This genuine replacement regulating washer (SKU: ST0438) is designed to fit STIHL 038 chainsaws, offering a precise OEM match with reference 9455 621 4010. Manufactured to exacting standards, this high-quality washer ensures correct oil pump function and reliable long-term performance. Ideal for maintaining your saw's lubrication system, it is a durable and essential component for any repair or rebuild. Features Genuine OEM replacement part – STIHL 9455 621 4010 for guaranteed fit and function. Precision-engineered for reliable oil pump regulation in STIHL 038 models. Durable construction withstands high operating temperatures and wear. Specifications SKU ST0438 OEM STIHL 9455 621 4010 Type Regulating Washer Compatible Brand STIHL Fits STIHL 038 Chainsaw STIHL 038 AV Chainsaw STIHL 038 Magnum Chainsaw Product Line Chainsaw Oil Pump Parts – Precision washers and seals for STIHL lubrication systems.