The Bates x Worm Diffusion Pump oil rig is a new innovative scientific collaboration between two well known and highly respected individuals in the glass blowing community. Steve Bates is one of the true innovators of the glass community with his glass butane torches and Hitman Torch Tubes. Worm has brought many new options into the concentrate world with his all-quartz puddle domes/swings.
The diffusion pump functions similar to a recycler with the main difference being the recycling action happens completely inside the custom built stem inside the hollow bubbler base. It uses a glass ball check valve system inside the stem to pull the water back inside the chamber to keep water from splashing up the mouthpiece even when being pulled on as hard as one can. This new innovation brings great flavor in a small overall package, with a clean scientific bubbler-style look and mouthpiece. The combination fo size, chamber and mouthpiece design make it great for handheld or table use. Comes stock with a 14mm quartz nail and a very unique diagonally cut clear dome with an upward curved solid horn. The clear dome is made to resemble the diagonal cut of the diffusion pump stem inside the chamber which makes for a beautiful clean matching look.
Dabbers Daily 
How does the hit compare on these to pieces w/similar amounts of water, but fed from the bottom? It seems this new Diffusion Pump would have less surface area contact with the water, thus less filtration/cooling compared to the same volume of water used in to a traditional style downstem-style bubbler.
Well in the diffusion pump the stem goes all the way to the bottom of the chamber/water and back up above to release the vapor. The vapor is going through about 6 inches of glass inside the water while it is also being pumped into the bubbles from the bottom check valve. This gives the hit a smoother feel in a smaller chamber than some of the other designs where the down stem is fed into a perc near the top of the water and it rely’s more on the holes/percolation to smooth it out than the water-cooling. In this design the full volume of water is actually being used to cool the smoke with less overall percolation, which helps this piece save a lot more flavor with each hit.
this piece is my new every day hitter, incredible design for exceptionaly smooth rolling hits with alot of cooling in i tiny package, great glass quality and impossible to get your mouth wet!