Molded polypropylene gas sampling bulbs have hemispherical ends for smooth gas flow and polypropylene stopcocks with free-turning PTFE plugs. Ends accept 6.4 to 9.5mm (1/4" to 3/8") I.D. tubing. Tube body is 51mm (2") O.D. x 222mm (8 3/4") long. Stopcocks are 64 mm (2.5") long. Maximum recommended pressure 15 psi. G1670-3 comes with 4mm straight bore stopcock on one end and silicone rubber septum mounted in screw fitting on the other end. Septum can withstand several injections. 6 septa included. Overall length 29cm (11 1/4").