The Pro 3 Dual Tank is a 510 threaded and will work on a 510 threaded MOD without the need for an adapter. The atomizer head of the The Pro 3 Dual Tank can unfasten when unscrewing the tube or base. Always secure the atomizer head before reinstalling the base of the The Pro 3 Dual Tank . The metal tube in the centre of this Clearomizer leads from the mouthpiece to the battery end. Avoid getting liquid in this tube when filling the Clearomizer. Replaceable Atomizer Heads.