Product says 5/16" but the actual size shown on the valve is 1/4". Since I needed them immediately for a school project, I didn't have time to go back and buy the right size elsewhere. I had to re-do all the hoses to match the valves. I would not buy this product again. I don't know why they marked them as 5/16" on the retailer label when you can clearly see on the packaging that the valves are 1/4".
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