Posachedwapa, NSEN ikugwira ntchito yatsopano yokhala ndi ma valve 635 pcs katatu.Kutumiza mavavu olekanitsidwa mumagulu angapo, mavavu achitsulo cha kaboni atsala pang'ono kutha, mavavu otsala achitsulo osapanga dzimbiri akadali pakupanga.Ikhala projekiti yayikulu yomaliza yomwe NSEN idzagwire ntchito mchaka cha 2020.

Sabata ino, ma eccentric mavavu omwe angomalizidwa kumene mu kukula kwa WCB DN200 &350 atumizidwa kwa makasitomala.