This is a diamond knot loop recycler banger by Midnight Glass. This banger is fully quartz and includes a 4 stack diamond knot and a extra long clear glass cap. This  banger is in 14mm male.

How to use a diamond Knot Loop Banger?

Simply heat all sides of the base just like a standard banger, and make sure to heat the loop a bit as well. You can then use the long cap as a dab tool to scoop wax, and then you want to melt the wax on the diamond knot. After the wax melts put the carb cap in place and you will notice any wax that gets tot he bottom of the banger will start recycling through the loop.