Iibhotile zeglasi kunye neebhotile ezibonakaliswe yi-tamper zizikhongozeli ezincinci zeglasi ezenzelwe ukubonelela ubungqina bokuphazamiseka okanye ukuvulwa. Zihlala zisetyenziselwa ukugcina nokuthutha amayeza, ii-oyile ezibalulekileyo, kunye nolunye ulwelo olubuthathaka. Iingqayi zinokuvalwa okucacileyo okuqhekezayo xa zivulwa, kuvumela ukubonwa lula ukuba imixholo ifunyenwe okanye ivuzayo. Oku kuqinisekisa ukhuseleko kunye nokuthembeka kwemveliso equlethwe kwi-vial, iyenza ibaluleke kakhulu kwizicelo zamachiza kunye nezempilo.