The Nectar Processor is a single cooler unit with a single inlet. The glass adapter makes it easier to inseert and remove the ash catcher.  It is a 14mm connection.  This one has dual 90mm colorized fans.

The MegaBowl is a single cooler unit that has two inlets and can handle waxes, flower and vape pens.  The full kit includes (1) Ash Catcher, flower bowl, quartz banger with cap, vape pen adapter, mouthpiece, Tar Buster filter and a bag of replacement charcoal.  To use the second side, remove the cap, install the provided glass adapter and add a second ash catcher (not included)

The XB1 Inline Smoke Freezer is a first of its kind.  It is a two-stage, multi-chamber pipe that cools like no other pipe in existence!  If you like the single Smoke Freezers, you'll LOVE the XB1 Inline!  You can add any 14mm accessory you like to it.  

The Engine is a dual chamber in parallel, meaning the vapor path goes through both chambers at the same time.  It can handle process a large amount of vapor and is nothing short of glorious to use!