As discussed N2 fill of 1Kg/Cm2 is 14.2 psi, it is essential a gauge is provided to show the pressure and a valve to relieve the contents.
Marking is necessary as this gas is lethal if it is vented too quickly and surrounds an operator - almost the same weight as air.
The MR stated the pressure but did not show a valve and gauge being required or vessel marking for N2.