Iwata Aibrush Replacement Part I-150-7 Packing O-Ring for Center Cup Iwata from $4.63 $6.18 Qty. Add to Cart SKU: I-150-7 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 O-Ring, Part I 150 7 for the Center Cup on the Iwata Hi-Line HP-TH Airbrush Tweet