Indandatho yokuvala emise okuka-X, eyaziwa nangokuthi iringi yokuvala inkanyezi, iwuhlobo lwendandatho yokuvala engafakwa emseleni ozinikele ngezinga lokucindezela elincane ukuze kuncishiswe ukungqubuzana, kodwa ingasetshenziswa futhi emseleni we-O-ring yencazelo efanayo. Indandatho yokuvala emise okuka-X inamandla okungqubuzana aphansi, inganqoba kangcono i-torsion, futhi ingafinyelela ukugcotshwa okungcono. Ingasetshenziswa njengento enyakazayo yokuvala uphawu ngesivinini esiphansi, futhi ifanele ukuvala uphawu okumile. Kuyintuthuko nokuthuthukiswa okusekelwe ekusebenzeni kwe-O-ring. Usayizi wayo ojwayelekile ufana ncamashi nowe-O-ring yaseMelika ejwayelekile.
