Caps for roals chals-ka waxaa laga heli karaa ha ahaato god furan oo loogu talagalay isticmaalka autosampler-ka iyo isku-darka caadiga ah ama dusha adag ee salka lagu keydiyo. Hal gabal polypropylene cap iyo xuubka ayaa sidoo kale la heli karaa. Koofiyadaha muraayadaha lagu dabooli karo ayaa loo qaabeeyey in lagu isticmaalo hal mar loo isticmaalo oo yareeya waqtiga diyaarinta muunadda maadaama aysan jirin dabool oo lagu daboolo si loo soo ururiyo.