Cov kav dej polypropylene muaj ntau qhov zoo. Lawv feem ntau siv thaum kho cov kav dej sib txuas. Nws yuav tsis yooj yim ua qhov no koj tus kheej. Ib qho tshwj xeeb soldering hlau yog siv los txuas cov kav dej thiab fittings. Cov cuab yeej no yuav tsum raug xaiv kom raug thiab siv raws li cov neeg tsim khoom cov lus qhia. Yuav ua li cas xaiv ib tug soldering hlau rau polypropylene kav yuav tau tham nyob rau hauv tsab xov xwm