Iwata Airbrush Replacement Part I-717-7 Needle 0.4mm for HP-M2 Airbrush Iwata from $21.38 $28.50 Qty. Out of Stock SKU: I-717-7 This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. This is the Replacement .4mm Needle for The Iwata Revolution HP-M2 Airbrush. Tweet