An air bag inflator (10) contains inflation fluid in a chamber (40) in a container (20). The container (20) has a fluid outlet (28) closed by a closure means (30). An assembly (50) connected with the container (20) includes a fill tube (120) for filling the container (20) with inflation fluid (42). A glass seal (140) blocks leakage of inflation fluid from the chamber (40) around the fill tube. In a preferred embodiment, the assembly (50) is an igniter assembly that includes two electrodes (100, 110). The glass seal (140) blocks fluid leakage from the chamber (40) around the electrodes (110, 110).