Bob, I plan on going with high pressure. I guess I am confused, I will need ball valves and needle valves or just needle valves. I guess I thought you just had to go propane tank hose to bottom of manifold then a length of pipe to first tier, use a tee then a ball valve and another length of pipe then hose to connect from manifold to burner, then repeat for each tier and use a pipe cap at the top to close it off. I guess maybe I'm more confused then I thought. Thanks again!