I thought it might be, too. The dryer I have is from a building I used to work at and was actually for control air on the HVAC system so it only had 3/8 lines going in and out. But my air grinder likes it so far. I ran it about 45 minutes today and it didnt have any problems keeping up. That's the tool I have that has the biggest cfm draw. I'm keeping my fingers crossed.