600mm Diameter Manhole Base`s

All IC160 chambers are classed as non-man entry access and limited
to 3 metre inverts in adoptable installations and 6 metres in non adoptable
installations as stipulated in Sewers for Adoption 7th Edition (SfA 7). Both the
IC160450 and IC160600 range comply with the SfA7 type 3 & 4 chamber
specifications, which means if the invert is above 1.2 metres then the access
must be restricted to 350mm for safety compliance.