Crossovers are used in any connection area where two connections don’t match up. This should be discussed with the Adtech Sales Team in full to make sure you get the right hookup for your application. It’s a good idea to draw out a diagram of your lower string to find out the necessary crossover subs needed. Adtech designs their motors to attach to the most common sonde housings. The sonde housings usually have a box at the drill pipe end and will connect to your drill pipe. For example, if the sonde has a 2 7⁄8” Regular Box on its connection and your drill pipe has a 2 7⁄8” Firestick Pin connection, you would need a crossover of 2 7⁄8” Regular Pin by 2 7⁄8” Firestick Box.