Review on 💧 Hygienic Open and Close Shut Off Liquor Bottle Pourers - Patented Design Spouts - Universally Fits Most Bottles - Setting the New Standard for Alcohol Pourers - 2 Pack (Black) by Ashley Williams

Doesn't fit in store-bought wide-mouth bottles. While the very thin ridges of the silicone pad still make contact with the inside of the neck of the bottle, the spout flexes as you open and close it. If you quickly turn the oil bottle upside down, the spout is likely to slip out. I ordered two packs. One spout had highly polished black plastic, while the other had gross excess plastic that I had to trim off with a razor blade, leaving unpolished plastic edges. Seems to be a quality control issue.