The Divertor Tokamak Test (DTT) facility is a superconducting tokamak being built at the ENEA Frascati to foster the development of advanced divertor solutions for the EU DEMO. The DTT Vacuum Vessel (VV) will be procured in three multi-sectors, in turn divided into one or more sectors; due to manufacturing and integration constraints, the different sectors cannot share the same design: some of them will be identically repeated (“Regular” sectors), whereas the remaining will all be one of a kind (“Special”). In DTT the VV plays also the role of neutron shield for the superconducting magnets, and therefore it will be actively maintained at the operating temperature of 60°C by borated water in forced flow to counteract the thermal loads (pulsed heating from the plasma and static radiative cooling from the thermal shield).