HANDHOL BOX, also known as visit valves or telecommunication ponds. Composite or polyethylene hand valves are usually less than 60 cm in diameter and are used to visit spaces that are not accessible, as well as to control underground drainage and to check underground facilities such as gas and electricity, telecommunications, etc. And if there is a problem in these transmission pipes, it can be controlled and fixed by inspection valves such as handhole door or manhole door. Based on their type of application, they are classified into two types, light and heavy.

A manhole or manhole cover is a removable plate that covers the wellhead. This opening is so large that a person can pass through it and this hole can be used as an access point. These valves are designed to prevent objects and objects from falling, as well as to prevent the entry of unauthorized persons and materials.

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