Hi, I just bought a RooR 7mm with beaker and its pretty tall should be around 20 inches. For diffuser I wanted to buy a Luke wilson 14 to 18 http://****************************...isure-glass-14-18-mm-6-arm-downstem-3-75.html thats 7 inches or a shower head Alex K. What would be better? I was looking for an AC/preecoler too. I thought of getting a SSFG inline precooler or a 12 arm ash catcher. Any advice on any other pieces? Thanks