Ufakelo lwe-HPLC kwivial, xa lusetyenziswa kunye ne-autosampler vials, luvumela ubuninzi besampulu yokufunyanwa kunye nokususwa kwesampulu lula kuba imilo ekokoniko iyayinciphisa indawo engaphezulu ngaphakathi kwevial. Zonke izimbo conical zofakelo zinikezelwa kunye nenqaku watsalwa zemveli kwakunye nokuphuculwa mandrel point.