1. Nws yuav yog tias cov dej nkag valve yog corroded thiab hnav. Thaum qhov no tshwm sim, nws yog qhov zoo los hloov lub qhov dej nres tshiab. Nws yog qhov zoo tshaj plaws los xaiv cov khoom siv tooj liab tag nrho, uas yog qhov zoo dua ntawm kev tiv thaiv corrosion.
2. Nws kuj tseem ua tau tias cov dej nkag valve tsis kho nrog daim kab xev. Hauv qhov no, tsuas yog qhwv daim kab xev ntawm qhov chaw nres nkoj threaded dua.