Blaze Glass - Diffuser Fixed Stem Precooler With Adapter - Blue Blaze Glass - Circ Perc Downstem Precooler With Adapter - Clear What is the difference other than price? Black Leaf - 3-Chamber Circ Perc Precooler - Rasta Why is this so expensive? My favorite. Molino Pre-coolers - Cobalt 1 section Flame looks amazing but may be not enough? WS Double Bubble 18.8 mm Precooler Which one should I get?