This gas sampling tube with polytetrafluoroethylene (PTFE) valves is designed for the collection and storage of environmental samples. High vacuum valves are provided for evacuation and filling. Open top cap with a PTFE/silicone septum allows analytical samples to be withdrawn. Both ends are ground to accept 3/8-inch ferrules and hand compressible fittings for a gas-tight seal. Each size has a marking area for easy identification. Capacity: 250mL. Height x Width: 95 x 290mm. GPI Finish: 13-425. Kimble Chase #: 653150-0250.