Originally Posted by Lawdog's Smokewagon
Yeah I noticed that too while looking at Lowes today that the actual hole through the center was not that big. Definately not 3/4" of course that refers to thread size not flow. The 3/4" PVC had much bigger hole for flow. I guess with the low temps you could use PVC valves especially if a riser pipe is used for intake.
Ball valves are sold as full port, half port and even 1/4 port...make sure you have full port or you won't have enough air flow to keep stoked...I have 3, 1 fully closed, 1 fully open and 1 half cracked for 225 deg.