Apply EPA Volatile Organic Analysis (VOA) methods when using Thermo Scientific Narrow-Mouth Septa Bottles. Available as clear or amber Type III soda-lime glass, these bottles feature a cap with molded-in septa retainer ring which holds the pierceable PTFE-faced silicone septa securely in place without bonding to the cap so septum can be removed and replaced as needed (except 1L bottle).