Originally Posted by rickoff

You can use PVC (as I did to build my SMACK booster) or ABS, however all new SMACK boosters manufactured by Dustin (the inventor) are now being made with acrylic bodies and bubblers. This is a more expensive solution, but the acrylic is better able to withstand and dissipate heat caused during the electrolysis process.

You might also consider using a pre-made acrylic cannister, such as is readily available at WalMart or Bed, Bath, and Beyond stores for about $10. They are great for bench testing and prepping the cells and electrolyte, as you have a clear view of everything going on inside the unit, and they have a wide top lid with an airtight seal, and a stainless latch which secures the lid and is easy to open when you want to add water or electrolyte, or remove the cell array. I kept mine for doing further bench tests, but you could certainly use the unit for an installation. Several other people have done that with no problems. If you go that route, be sure to use at least one bubbler at the side of the unit, and better to add a second bubbler closer to the point where you are introducing the HHO gas into the intake airstream. I also added a blowout cap device on the lid for extra protection under a worst-case scenario of explosion within the device. See the following video for an intentional blowout test, which shows the method I adopted: YouTube - #81 - VSPB Cell blowout test 1

Best wishes,

Rickoff