A glass carb cap is the small piece that makes low-temp dabbing work. Set it over your banger after applying concentrate to trap heat and control airflow. With the cap on, the concentrate vaporizes more evenly at a lower temperature, so less gets left behind in the banger. It also works with terp pearls to keep them spinning. Check that the cap fits your banger's opening before use. Let it cool fully before rinsing, as hot glass can crack under cold water.