has anyone tried to make a sandblaster? i have a 20" long piece of 10" dia pipe 1/4" wall. i've posted a link to a u-tube video where a guy has made one. my question is, do i need to make the air bypass or can i just run an airline into the top of the tank then bring a hose out of the bottom? what is the purpose of the air bypass?



http://www.youtube.com/watch?v=q2Q06euHcVI