This filter housing for HS45 and HS52 hedge trimmers is a genuine Stihl OEM component (part no. 4228 140 2850) designed to protect the air filter assembly. Made from durable, impact-resistant plastic, it shields the filter from dust, debris, and accidental impacts, ensuring clean airflow to the engine. This helps maintain reliable running, consistent performance, and long-term engine efficiency. Built to original specifications, it provides a secure fit and correct sealing, making it an ideal replacement for cracked, warped, or missing housings.