clamps are very cheap. No suitable driver could be found. 1/4 inch too big. The clamping heads are ground by hand. The 5/16" valve was changed to 3/8" because the 5/16" was too small for the 5/16" line. Fits 3/8 inch. The valve is fine, the tightness is good, it seems fine. I think it's ok for the price, just be careful with the clips.
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