A Thio Material manhole is produced in a similar way to a classical concrete manhole. The pit is robust and consists of a base unit provided with shaft units and a cover slab. All this, in a smooth wet cast production process  to guarantee the high-quality characteristics as to DWF (dry weather flow)  of the whole manhole. A PTV (technical regulation) is being finalized, which  will result in a  COPRO or BENOR quality label at your disposal.