This is a male pipe thread on both ends. (A bell reducer has female pipe thread on both ends)
The Reducer is used to connect two material hoses of different sizes. Both ends of the reducer are male pipe thread. To connect the hoses together.. each end of the hose will have the appropriate Kamlock size. The same goes for the Reducer. So a Reducer that is 2″ –> 1.5″ will need a 2″ Kamlock on the 2″ side.. and a 1.5″ Kamlock on the 1.5″ side.