I wanted a second cooling unit because I grabbed an 80mm quartz stem. It holds two cooling units so I needed another. Very slick setup. It’s great to have a spare to save time cleaning. your dirty uniy can soak in dish soap while you use a fresh clean one. I have taken the screw, nuts and washers out of one cooking unit and placed a 9mm ruby between the cans. This works great!

Great product! Serves great as a backup!

I ordered 3 of these a few months ago and can't complain. However, at the time I ordered, they were under $5. They matched their price with the competition. Sad....

Pricey for what it is, but it works well. Not really necessary if you are connecting with a water pipe. Otherwise, it's always good to have a clean spare.