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.