Wide Application: This vent cover is suitable for camper, RV, yacht, boat, sailboat, bus, stairs, warehouse and other interior spaces, suitable for 3 inch to 4 inch pipes High-quality material: The head of the cover is made of stainless steel, which is sturdy and durable, not easy to rust, and the bottom is plastic, which can withstand various harsh weather conditions and long-term use Stylish appearance: The stainless steel adopts arc surface polishing, which is more delicate, more beautiful and unique, and is a good choice for you to decorate the interior space Flexible adjustment: This vent cover adopts an adjustable design, you can control the air outlet according to your needs, which improves the practicality of use Package & installation: Includes 1 x Boat 3" Domed Air Flow Vent. No instructions. Professional installation is highly recommended Wide Application: This vent cover is suitable for camper, RV, yacht, boat, sailboat, bus, stairs, warehouse and other interior spaces, suitable for 3 inch to 4 inch pipes High-quality material: The head of the cover is made of stainless steel, which is sturdy and durable, not easy to rust, and the bottom is plastic, which can withstand various harsh weather conditions and long-term use Stylish appearance: The stainless steel adopts arc surface polishing, which is more delicate, more beautiful and unique, and is a good choice for you to decorate the interior space Flexible adjustment: This vent cover adopts an adjustable design, you can control the air outlet according to your needs, which improves the practicality of use Package & installation: Includes 1 x Boat 3" Domed Air Flow Vent. No instructions. Professional installation is highly recommended