One way air valve allows air to travel in one direction only, this prevents the air line from becoming a siphon line when the air pump stops. The risk of air line becoming a siphon line is that water gets into electrical parts and can cause electrocution.









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. I assume there is reasons for different positions..for me, I simply use 2, because my counter somehow got a backflow prob, so I add another valve to prevent water from getting into the regulator

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