The enclosures of the pumping stations and fittings offered by Uponor Infra supplement sewage chamber and manhole system. The external skirt, similar to manholes and chambers, is made from polyethylene double-wall Weholite pipe of a diameter from 800 mm to 3000 mm. The extrusion welding technology allows to obtain the enclosures guaranteeing that the properties of Weholite pipelines and chambers are observed. They are successfully used as the enclosure of the sewage network pumping systems or sewage pumping stations. The construction and parameters of the enclosures are selected on a case by case basis based on the guidelines of the client considering the water-soil conditions.