I'm assuming this is for briquettes...no, wait...1-1/2" ball valve would be too small for briqs...are you burning pellets?Trying to build a gravity feed burner for my smoker. Can't get the heat up past 110 degrees. The firebox is 6 x 6 the inlet is 1 1/2 ball valve and the outlet is a 2" pipe. Thanks for any ideas on the project.