Sparmax [SP.ABFMAC] Sparmax Silver Bullet moisture filter with MAC valveA favourite and essential accessory for the airbrush, the Silver Bullet MAC Moisture Trap retains the same small, compact size of its Silver Bullet moisture filter whilst including a built in MAC (Micro Air Control) valve. This allows for tiny adjustments to your air flow as it only allows the designated pressure to pass through to the airbrush. During operation, there will be no sound of air 'bleeding', as unused air will be stored in the compressor.