I use these pumps with my liquid foundation and jojoba oil. They are great for the base. I can squeeze out a pea-sized amount by pressing the pump all the way down, or just a dab by pressing lighter. The bottle was easy to fill and is a lot better than trying to pour the base out of the original bottle every time I use the product. I also used a jojoba oil bottle. It did not work. Product is dispensed, but the air gap at the top does not go away (despite attempts to push the piston up from the bottom with a long, thin metal rod), and each pump leaks oil from the pump at multiple locations. I wouldn't use it for oil again but I will definitely use these bottles for foundation again.
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