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1/2" Hose Barb. It is intended to be used in pressurized systems, not in gravity feed systems. This is a normally open valve. Normally open valves are "OPEN" in their de-energized state (i.e. when no electrical power is applied, the valve is open).
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.