According to NF EN 476, a service box : DN <800mm allows the introduction of cleaning, inspection and testing equipment, but does not allow personnel access.
The VISIMOP Monobloc 5455, diameter 600 with 3 inlets and 1 outlet, is a polyethylene inspection or service box. It is designed for free-flowing PVC networks in diameters 160 and 200, with the option of drilling inlets in diameters 125, 160 and 200. The monobloc manhole is marked NF a by the CSTB, which certifies that the manholes comply with the characteristics described in the NF 442 certification standard.