Ivalve yebhabhathane ekwisiphelo seGrooved i-grooved end bubble yivalve yebhabhathane egobileyo eqinileyo eneempawu zokuqukuqela ezibalaseleyo.Itywina lerabha libunjwe kwidiskhi yentsimbi ye-ductile, ukuze kuvumeleke ubuninzi bokuhamba kwamanzi.