Getting liquids out of gallon cans has always been difficult. Actually, getting it out was always easy, doing it without making a mess is the hard part. This pump for 1 gallon cans makes this miserable job simple. Just remove the can lid and replace with the Fluid Film Pump. This makes it very easy to refill your bottles or small cans. If you use a lot of Fluid Film, you can save money by purchasing the gallon containers.