This exhaust pipe works with all heaters having a 38mm exhaust port. Always terminate the exhaust pipe at least 1inch past the exterior side or rear of the vehicle for proper ventilation. Avoid dips in pipe routing to condensate and ice buildup inside the pipe which inhibit proper heater operation. Stainless steel material, strong and , not easy to rust. Product Name: Exhaust Pipe Inner Diameter: 38mm Fitment: For Air Heater For Air Heater For Airtop 40, ATEVO 40 For Airtop 55, ATEVO 55 For Airtop 3500, AT350 For Airtop 5000, AT5000 (Please Compare The size With Your One Before Purchasing!) Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Colour:Photo Color Material:Metal Package Contents: 1 x Exhaust Pipe Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.