ATD TOOLS 2 Drum Thread Adapter, Converts 2 Coarse to 2 Fine Thread, Versatile Adapter for Fluid Transfer, Black The ATD TOOLS ATD-5006 Drum Thread Adapter allows ATD pumps to be used on plastic barrels. This adapter converts a 2 coarse thread to a 2 fine thread, enhancing the versatility of existing pumping equipment. Its durable construction ensures long-lasting use, making it an essential addition to any shop or fleet maintenance operation dealing with fluid transfer.