Sportsways has been gone for a long time. That was the only company to use that 1/2" O-ringed tank valve to my knowledge. Again, there is nothing special about the valve make up. You can use the generic parts readily available just about anywhere that valve parts are sold. If it still has one of the slotted plugs for a burst disk, be VERY careful when trying to get it out. If you don't watch what you are doing, it is possible to eat out the threads with your screw driver. Once it is out, replace with a standard hex head plug kit.