A piece of glass that is meant to connect two parts of a smoking device so that they can work together, usually in a bong or dab rig. The locations where the two pieces meet are referred to as joints, and joints come in a variety of sizes and shapes:male and female, as well as 10mm, 12mm, 14mm, and so on.

If you own multiple dab rigs and bongs, you probably don't have the same fittings on each one. An adapter will let you use the same banger with multiple glass pieces if you want to use it on all of your dab rigs.
The majority of adapters are made of glass and are designed to seal two other pieces of glass together. Glass-to-glass adapters are becoming the standard because they work just as well and don't need to be replaced as often as rubber-to-glass seals do.

It Is Critical to Accurately Measure Your Adapter and Fittings the bowl/banger's size—10mm, 12mm, 14mm, etc.—must be known.and the machine. Additionally, you must know whether each piece is male or female. Simply slide the appropriate adapter onto the bong or dab rig and attach the bowl or banger to the opposite end once you have it.