Male Vs Female Joints
The first and most important thing to know when determining the right piece to buy is the joint gender. Bongs, bowls, nails, ash catchers, adapters, dropdowns, and all other bong parts have a gender, male or female. All you need to know is that male pieces go into female joints and female pieces go on top of male joints. So if your bong has a female joint you will need to buy a male jointed bowl or dab nail and vice versa.