About product and suppliers:
            1,682 underground operating products are offered for sale by suppliers on Alibaba.com, of which automatic door operators accounts for 2%. 

A wide variety of underground operating options are available to you, such as 1 year, 2 years, and 3 years. You can also choose from online technical support, free spare parts, and return and replacement underground operating

There are 940 suppliers who sells underground operating on Alibaba.com, mainly located in Asia. The top countries of suppliers are Italy, China, and Malaysia, from which the percentage of underground operating supply is 1%, 93%, and 3% respectively.