The channel blocks are the construction parts with individual transverse profiles, except for the connection locations, and they can be fitted with additional elastomer wedge sealing inserted in the semi-groove on the element shank. It includes the construction parts of the inlet channels used for the inspection, maintenance, ventilation, and deaerating sewer. The channel blocks have limbers made of steel with plastic coating built in dowel pins. The channel blocks have built-in basalt lining within the scope 180o at the full wall height.

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