This is a 2, 3, and 4 post optional dripper that is easily changed by disconnecting the copper contact screw and applying the necessary post option. We give you a similar heatsink design that we incorporated into one of our previous projects which dissipates heat through delrin inserts. We included every spare part needed such as extra insulators, screws and O-rings. We hope you enjoy our newly designed airflow control that is truly optional given the styles that we have provided. It all started with the Mutation X back in mid 2014 and we are happy to bring you our V234!