PPR yeeb nkab installation cov kauj ruam

Nyob rau hauv lub ntiaj teb no nthwv dej ntawm lub tsev muab dej system upgrades, PPR (random copolymer polypropylene) cov kav dej tau maj mam hloov cov kav hlau ib txwm muaj nrog lawv qhov kub thiab txias tsis kam, corrosion kuj thiab xoom leakage yam ntxwv.…