$107.50
This is the air cap for round pattern Graco Fusion AP and Fusion PC spray guns. Graco's service manual describes it as an air cap for round pattern guns, and the exploded parts diagram lists it as the round air cap.
The air cap sits at the business end of the gun and shapes the air around the spray, so it is directly involved in the pattern you get. Air caps are a familiar replacement item on a working gun.
Make sure you are ordering the round pattern cap rather than another cap on the diagram, and match the part number to the position shown on your own Graco drawing. Genuine Graco OEM part 15B210.
