A fill valve (200) adapted for use with a pressurized fluid container includes a fill port (112) configured to be in fluidic communication with the pressurized fluid container and a fill valve member (201) configured for selectively blocking the fill port (112) and configured to be non-openable after the fill valve member (201) has been moved to a blocking position that substantially closes the fill port (112). The fill valve member (201) includes a valve member body (210) and a break-away head (220) joined to the valve member body (210) by a breakable neck (228). The breakable neck (228) is configured to break when the fill valve member (201) is moved to a substantially fully closed position in the fill port (112).