You will be excited to know that Senco PC1010 has a 1-gallon air tank. That means you will not stop in the middle of your work for lack of air pressure. In addition to this, you will observe a protective drain valve on the bottom of the air machine.
Suppose, if you want to empty the tank for some time, you can do that easily by just simply drain all the air and make it fill-up again. But, my suggestion here is please tightly close the valve for every after use. Else, the inside air may lick out because of insecure attachment.