Cov kab lus qhia hauv qab no yog txhua yam hais txog cov hlau yeeb nkab fittings , los ntawm cov lus qhia txog cov lus, koj tuaj yeem tau txais cov ntaub ntawv cuam tshuam, sau ntawv siv, lossis cov khoom lag luam tshiab tshaj plaws txog cov hlau yeeb nkab . Peb vam tias cov xov xwm no yuav muab txoj kev pab koj xav tau. Thiab yog tias cov tshuaj yeeb nkab fittings tsis tuaj yeem daws tsis tau koj cov kev xav tau, koj tuaj yeem tiv tauj peb rau cov ntaub ntawv cuam tshuam.