· Ua kom huv, tsis muaj kuab paug, tsis muaj tshuaj lom thiab tsis qab, uas tuaj yeem cawm tib neeg los ntawm kev haus dej "dej" thiab "dej xeb";
Kub thiab siab tsis kam, kev siv ntev kub tuaj yeem ncav cuag 95 degree;
Anti-ultraviolet, tiv thaiv kev laus, kev pab cuam lub neej mus txog 50 xyoo;
Yooj yim khoov, yooj yim thiab ceev installation, ob peb yeeb nkab fittings, kev lag luam thiab kev siv, siv cov yeeb nkab tshwj xeeb, nws tuaj yeem ntsia tau yooj yim thiab sai;
· Tsis xav tau tapping, snap-fitting thiab vuam;
· Kev tiv thaiv zoo dua rau ib puag ncig kev ntxhov siab tawg.