Thickened Material: Wall Thimble is made of thickened stainless steel material, which has higher strength and stability compared to ordinary materials, is not easily deformed, and can maintain good performance for a long time, providing reliable protection for your home heating and bathroom ventilation system. Even in harsh environments, it can operate stably and have a longer service life. Accurate adaptation and flexible installation: with an outer diameter of 3.15 inches and a scalable length of 4.7 inches to 7.0 inches, the wall thimble can perfectly adapt to walls of different thicknesses. Whether it is a new house or an old house renovation, it can be easily installed to meet the needs of various home heating and bathroom settings, ensuring the smooth operation of the ventilation system. Good sealing performance, safe and reliable: Thickening Stainless Steel Vent Wall Thimble has tight internal connections and excellent sealing performance, effectively preventing exhaust gas leakage and ensuring the health and safety of you and your family. At the same time, it can also avoid heat loss and improve the overall efficiency of the home heating system, allowing you to enjoy warmth while using it with confidence. Streamlined design, efficient ventilation: The surface of the wall sleeve adopts a streamlined design, which can ensure consistent and uninterrupted airflow, reduce airflow resistance, improve ventilation efficiency, and enable smooth and stable discharge of exhaust gas, further enhancing the performance of the home heating system and making your living environment more comfortable. Professional after-sales service, worry free guarantee: If you have any questions or encounter any problems during installation and use, our professional team will be dedicated to serving you and solving your worries. Suitable for walls ranging from 4.7 "to 7.0"