This is the manhole with the connector that solves the problem of the loosening and water leakage of the connecting parts of the manhole and underground pipes which are the biggest problem at the site of replacing the gathering pipes. It shuts off the water leakage, and reduces the time of construction, and that brings synergy.

In order to prevent the leaning of the manhole in case of the inflow of the earth and sand, it was designed to integrate the lower sphere, vertical sphere, and the upper sphere, with the bolts fastened at each assembly parts (refer to video), making it the most future-oriented manhole to solve all the problems of construction.

In the past there was the water pressure test, and now it has been changed to the air pressure test, and this is the only manhole product that was qualified by the test result. And it is the strongest manhole that can satisfy the construction site. The perfect connection at the connecting parts came from the excellence of the mould which was processed with precision. (Refer to video),