Airgap AG200-004 Dual Air Gap for Double Drawer or Two Separate Dishwashers with Skirted Cap and Extra Long Thread for Thick or Thin CountertopsAirgap AG200 004 A dishwasher air gap is a critical component in maintaining a safe water supply. It prevents contaminants in the sink from flowing into the dishwasher and is required by code in most states. The AMERIGAP brand dual dishwasher air gap provides many advantages over other air gaps available on the market and ensures safety and peace of mind that your water supply is clean. A common misconception is that a high loop (routing a drain line