D7 is a tunnel car washing machine with 7 washing brushes, which is the economic version of D9. This tunnel type of equipment can wash cars quickly and continuously, and it can wash 50-60 cars per hour. Its production greatly meets the needs of customers with large business sites and a large amount of car washing. Now many customers with a daily car washing volume of more than 500 cars are using this equipment. This tunnel type of equipment is sturdy and durable. Its appearance takes into account the likes of domestic and foreign customers. It covers a relatively small area, has strong adaptability to the site, and has excellent performance. It is favored by some customers who are limited by the site and want to install tunnel machines.