Hey guys I have bee racking my Bran on trying to figure out how people on youtube use a Garden sprayer for a gun shot affect. I mean I get it. they put fake blood in a garden sprayer and have a hose attracted to an actor with a hole in the tube that makes the blood squirt out. What I am confused is how they get the blood to shoot out. I know they pump the sprayer but is there a valve or something? does anyone have a video somewhere where it shows you step by step. It seems every one I have seen has left out that one crucial part. "how to get the blood to spray out"