“Piarkom” sewer pipes made of polypropylene and polymer copolymer with a nominal OD 50 and 110 mm are applied for the household sewerage at max. 80ºС of the permanent discharges and at 95ºС of the temporary (within 1 min.) discharges when a maximum flow level is 30 l/min. The pipes are manufactured by means of an uninterrupted screw extrusion followed by molding of a ball-mouthed part.