This exhaust pipe is compatible with heaters featuring a 38mm exhaust port. Always extend the exhaust pipe at least 1 inch beyond the exterior side or rear of the vehicle for proper ventilation. Avoid low points in the pipe routing to prevent condensate and ice buildup, which can hinder heater performance. Made of stainless steel material, durable and resistant to rust. Product Name: Exhaust Pipe Inner Diameter: 38mm Fitment: 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 unit before purchasing) Note: Installation guide not included. Professional installation is strongly recommended. Please verify specifications to ensure compatibility. The product may vary slightly between batches, including minor differences in appearance or color, which do not affect functionality. Color: As shown in photo Material: Metal Package Contents: 1 x Exhaust Pipe Only the items listed above are included; other items are not part of this package. Note: Lighting effects and display settings may cause slight variations in color representation between the image and the actual item. Measurement tolerance: +/- 1-3 cm.