Neon tubes are capped off by two glass electrodes which have wire passing from outside to inside. One of these electrodes has a tubulation, a small tube which remains as a passage from outside to inside. The tubulation is sealed to the pumping system or manifold. The manifold has glass stopcocks or valves that allow sections to be selectively opened or closed.
An ultra high vacuum pump pulls the air out of the tube while a high voltage-high amperage transformer bombards and heats the remaining air to produce temperatures in excess of 500 degrees F.
This allows the tube to achieve a higher degree of purity. When a very high vacuum is reached and the tube begins to cool, a small amount of inert gas is introduced from a flask or tank. The tubulation is then heated and as it is pulled it sucks in to make the tubes own seal.
You can see our neon gas facility in our blog and website - http://wikineon.highwire.com/
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