Dave, from the photo, looks like a Presta valve tube with a threaded Schrader adapter. If you unscrew the little adaptor atop the valve, it will probably reveal a Presta valve. Some folks leave the adapter on all the time in case they get stuck somewhere without a pump, as it will allow you to fill the tube from a gas station pump.
Presta valves have a small screw nubbin which needs to be unscrewed to the open position before you can get air in or out of the tube. Schrader valves are the typical auto tire valve, no unthreading needed, and there is no nut holding the valve to the rim as with a Presta valve. Presta valve sections are metal, Schrader are rubber.
One word of caution - tubes and tires expressed in decimals are not equivalent to those expressed in fractions. Make sure to order the same size tube as before, so if yours is in decimals, order the appropriate decimal tube.