Cov kab lus qhia hauv qab no yog txhua yam hais txog cov yeeb nkab fittings , los ntawm cov khoom muaj feem xyuam no, koj tuaj yeem tau txais cov ntaub ntawv tseem ceeb, sau ntawv hauv kev siv, lossis cov ncauj lus tshiab txog cov yeeb nkab fittings . Peb vam tias cov xov xwm no yuav muab kev pab koj xav tau. Thiab yog tias cov khoom siv yeeb nkab fittings tsis tuaj yeem daws koj cov kev xav tau, koj tuaj yeem tiv tauj peb rau cov ntaub ntawv tseem ceeb.