Review (1/5): not a good product
product description does not say you have to modify the bottle cap as the pump does not come with a cap. It also needs to screw together and the threads want to crossthread. does not come with any instructions. I accidentally turned it upside down trying to put it together and the spring and check ball came out. The ball is very small and went down the sink. I got it all put back together and it pumps very little.