Ama-grommets ekhebula e-Upin ayindilinga/ayisikwele alingana kumaphaneli aphansi okufinyelela ukuze anikeze indawo yokuphuma ephephile, ehlanzekile nesebenzayo yamalayini wamandla kagesi, izintambo zefoni, izintambo zedatha namapayipi evacuum.
I-grommet yakhelwe ukusetshenziswa emsebenzini osindayo njengoba yenziwa ngepulasitiki ye-ABS ehlala isikhathi eside.I-grommet ifake idizayini ehlakaniphile nelula, Umzimba wepulasitiki udlulela kuphaneli ukuze uvikele izintambo.