The Planted Tank Forum - View Single Post - Metering(needle) valves selection for our CO2 pressurized system
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Old 02-16-2013, 04:58 AM   #237
Darkblade48
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This is the Burkert? I am pretty sure polarity does not matter for AC solenoids.

However, if you want to be consistent, the left prong of a power cord is neutral (white), the right prong is live (black), and the bottom prong is ground (green).
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A Primer to Pressurized CO2 and A Primer to Planted Tanks
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