Utilized in underground water supply systems. It is installed buried, on a concrete slab, above the well. Inside, a pump and/or other related equipment are mounted. The flat area at the base of the chamber is drilled with a drilling machine and a core drill. The well pipe is passed vertically through the cutout. Sealing is achieved with a Kompact series rubber gasket. From the pump/equipment, the water pipe exits horizontally. The wall penetration must be made through the flat surfaces and not on the rib, with a maximum passage diameter of D 125 mm. Component elements: chamber, lid, and locking system. The chamber and lid are manufactured by rotational molding from blue polyethylene, featuring: -average outer diameter: 1430 mm -base diameter: 1500 mm -access: 640 mm. The locking system consists of two locks positioned diametrically opposite on the lid and an operating key. The lock is mounted so as not to affect the sealing in the lid area.