Manhole pipes made of PVC-U are approved for use in drinking water systems with the production process controlled at regular intervals. The pipes are produced in accordance with the PN-G-02323 standard and have a Polish Hygienic Certificate issued by PZH in Warsaw. Manhole pipes are offered in ranges PN6, PN-8, PN 10, PN 12.5 with the standard assembly lengths of 1, 2, 3, 4 and 6 mb in version both with socket for bonding and without bonding, in diameters DN 110 - DN 315.