I bought 2 of these and 4 of the smaller 8oz. The 4 ounce pumps opened instantly, easily and with no issues. On the other hand, it took me over 20 minutes to open these 16 ounce pumps. My left thumb has stopped working and I'm right-handed so I keep it in my left hand and try to turn the pump counter-clockwise for 20 minutes and try to pump the pump (when I take it out of the bottle) with my left hand pinching my hand like someone else suggested left my left arm red and painful. Def won't be buying those 16 ounce pumps anymore. Too much effort to get them working. UPDATE: They refunded 2 bottles so I'm giving 2 more stars. Apart from what I mentioned, otherwise they are good bottles. I hope these pump issues were an accident as the smaller ones were fine.
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