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This site states the following, "Automatic, Electronic, Pneumatic Drain Valve." We observed that the web site also said " How does it work? The Expello Air Products Electronic Drain Valve expels contaminants every five minutes with a powerful one-second blast of air." It also stated " The Expello Air Products Pneumatic Drain Valve purges contaminants with a blast of air whenever the compressor cycles. The Expello Air Products Shop Valve automatically removes moisture from the shop air compressor storage tank. This field is for validation purposes and should be left unchanged." The header had expello air products as the highest ranking keyword. It was followed by Expello Drain Valve, Expello Electronic Drain Valve, and Expello Pneumatic Drain Valve which isn't as ranked as highly as expello air products. The next words the site uses is Expello air dryer. expello automatic drain valve was also included and might not be viewed by search parsers.