A typical product from China that looks good but isn't quite right. You look good. Side threads 1/8 NPT are OK. Fits 7/16 wrenches. But the 1/4" notched side is not designed for 1/4" inner diameter tubing. Fits loose and sloppy. It can be made for 6mm tubing but definitely not for 1/4 inch. It's not clear why people value hose fit so highly when they simply don't know how a fitting is supposed to fit into a hose.
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