Description General description Thick-wall, natural latex rubber. Provide method for maintaining dry, oxygen-free atmosphere over small scale laboratory reactions. Slight positive pressure is maintained in balloon, which serves as reservoir to accommodate pressure changes and to ensure net flow of gas out of vessel in event of small leak in system. Also useful for delivering small quantities of nonhazardous gases from cylinders to other use locations. Assorted colors (Quartz Purple, Sapphire Blue, Emerald Green, Ruby Red, Citrine Yellow, Mandarin Orange, Jewel Magenta, Diamond Clear).