Iwata Airbrush Replacement Part I-722-2 Fluid Adjustment Valve for HP-M1 and HP-M2 Airbrush Iwata from $29.81 $39.75 Qty. Add to Cart SKU: I-722-2 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 Iwata I-718-4 Replacement Lid for HP-M2 Airbrush. Tweet