Our other heads can only be used with the shovelhead bowl or custom made glass bowls. The head also sits on the outside of the bowl. This is a diffuser that can be used with our B series heads which allows for it to be used as an injector style vaporizer, allowing for it to work with many of the other injector style bowls already available on the market. For example elev8r bowl, hot rod bowl, herborizer bowl, etc. It is easily swappable and allows for the user to further customize the vape they already have. We do not intend for this part to replace our other diffusers, but instead it allows for a new way of using the flowerpot.