The air is waiting for the express delivery. The water pressure is not lasting, and it will break at both ends in three days. You can buy a new one just by buying spare parts for maintenance. Three of them have been trampled, and all of them with hydraulic pressure below 500 have been used, with the same quality. Mechanical is the kind of gym. It's big and nobody uses it. It takes up too much space and is expensive. Hydraulic pressure is not recommended.