I purchased this Treehouse percolator for my brand new Dabbler pen, and honestly I've never had a piece of glass I like this much. Dab pens are uncommon around here as is, let alone a pen with a water attachment.
(I ordered the electric blue style, and upon arrival realized that there are small glitters and a spiral visible in the dark blue, something I was not expecting. I would now prefer the Siberia blue style, the sky blue would go well with the Treehouse branding, and I'm not big on the gaudy sparkle of the electric blue. Cool nonetheless, of course).
The glass itself is a tree style percolator with 8 stems. You will never have to worry about the water inside threatening your skillet or battery thanks to an ingenious curve on the glass through the entire line of the piece. I even hit mine laying down, and also rest the entire pen and perc sideways on the table; I've never had any water spill or leak.
Any dab residue can be easily cleaned by agitating isopropyl alcohol within the glass, and this evaporates dry quickly.
Mine came with the skillet used on the Vapor Brothers Titanium Globe, and this works well, however I am buying the actual Dabbler glass tube heaters as replacements and spares for travel.
All in all, a fantastic piece. I'm very happy with my order, and will likely order a second Dabbler and the Siberia Blue version of this percolator in another paycheck or two. This pen was rated #1 in a High Times article about vape pens in 2014, and it's easy to see why.