Pump It Up

In Yes -2- Tech we wanted to figure out how we can make a pump to go outside to pump the 200 gallon tank. So first i took apart a hand soap despenser.There were so many parts in it, to make the soap come out. It actually had a ball bearing something i didnt know was in a pump, also it was a spring in there too. Nao asked us the question, what is used to make the soap go up through the pump? So we had to fiqure you out what each part do an order to make the soap come out of the pump. Then next Me and KiOntey took apart a water gun, it took us a minute because, we had to unscrew alot of screws. When we finally got it open it had a  tube connected to a piston and it also had a spring; like the soap despenser. After looking a both types of pumps, now we know what we need to make our own pump.