ROTO inspection shafts are made of polyethylene [PE] and are used in gravity sewer systems for rainwater and municipal wastewater. Sewer manholes allow ventilation, cleaning, maintenance and access to sewer pipes. MANHOLE SHAFTS ROTO calming shafts are made of polyethylene [PE] and are used to calm water in steep sewage systems for rainwater and municipal wastewater. They are available in diameters DN 800 and DN 1000. The shafts are made to order according to the customer's requirements. WATER CALMING SHAFTS Catalog JAŠKI