7 Connector Set Adaptor Kit for Airbrush A1: M5-0.5 female to 1/8" BSP male A2: 1/8" BSP male to 1/8" BSP male A3: 1/8" BSP male to 1/4" BSP male A4: 1/8" BSP male to 1/4" BSP female A5: 1/8" BSP female to 1/4" BSP male A6: 1/4" BSP female to 1/4" BSP male A7: 1/4" BSP female to M5x0.5 male