Afai e mana'omia se alatoto e lua-directional e faatonutonu ai le tafe i luma ma puipuia ai le tafe i tua, o le NSEN uamea nofo i le lua-directional valve o lau filifiliga lea.O le faʻamaufaʻailoga e faʻaaogaina atoatoa le uʻamea i le fausaga uʻamea, o lenei faʻasologa e tele lava ina faʻaaogaina i le Fuafuaga Malosiaga, Faʻasao Tutotonu, Suauʻu & Gas alamanuia.Faʻafeiloaʻi e faʻafesoʻotaʻi matou e maua le faʻamaumauga poʻo le faʻapipiʻi valve mo lau galuega.