Piston ring replacement for EX17 and EX21 engines, 67 mm diameter, OEM quality. Designed as a directfit part to simplify maintenance and restore proper engine sealing. Key benefits Restores compression and sealing: Replaces worn or damaged piston rings to help reduce blowby and oil consumption during operation. Direct OEMfit: Sized and shaped for model compatibility to allow straightforward installation without modifications. Simple maintenance: Intended for routine engine , making service faster and minimizing downtime. Consistent performance: Manufactured to meet OEM quality expectations for reliable fit and repeatable results. Product features and attributes Function: Replacement piston ring for small engine and engine rebuilds. Compatibility: Fits EX17 and EX21 engine models. Size: 67 mm piston ring diameter for accurate matching to specified engines. Construction: Precisionengineered to meet OEM quality standards for durability and consistent sealing. Performance: Helps restore compression, control oil usage, and maintain engine efficiency when installed correctly. Typical applications Small engine : worn rings during a end rebuild or after diagnosing compression loss on EX17 or EX21 engines. Routine maintenance: Use as part of scheduled maintenance to maintain reliable operation of garden equipment, generators, or other small machines powered by EX17 or EX21 engines. Equipment refurbishment: When refurbishing engines for resale or prolonged use, install the ring to ensure component compatibility and serviceability. Installation and care Installation is intended to be performed by someone with basic small engine experience using appropriate tools. Inspect piston and cylinder for wear before installing a ring; or machine components as needed to ensure proper sealing. Follow engine manufacturer guidelines for ring end gap and orientation if available. This piston ring provides a practical, OEMquality option for maintaining and repairing EX17 and EX21 engines, helping to restore sealing performance and support reliable equipment operation.