Mason Jar Pour Spout Adapter
thingiverse
Although specifically designed to adapt the "spill-stop manufacturing company" brand medium chrome plastic pourer (available from Cash and Carry or [[ HERE ]]) it should work with just about anything you would put in a bottle. I've tried other cork style pourer's and wine bottle stoppers and all worked. I use this to adapt my various cooking oils, vinegars and other liquids to simplify the storage need.
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