Waterproof casing txhav yog hlau ntxiv tis rings (steel ntiv nplhaib ntawm cov yeeb nkab), mounted phab ntsa (qhob ntsa) rau cov yeeb nkab los ntawm phab ntsa, uas yuav pab kom phab ntsa waterproofing;
Saj zawg zog waterproof casing tas li rau ntiv nplhaib koojtis lwm, hauv muaj stalls vajvoog, falanneisi, poob muag nyob rau hauv lawm, los yog lawv tus kheej ua, txhav waterproof casing cov raj hlau kom poob siab absorber xav tau, xws li thaum siv xa los rau ntawm cov phab ntsa thiab lub twj tso kua mis.