Graco Fusion ProConnect GunFeatures of the Graco Fusion PC Spray Gun With ProConnect technology in the Fusion PC gun, the entire fluid section including the side seals and all associated o rings are replaced in a single cartridge compared to individual parts like the Fusion AP. This allows you to rebuild you gun like a pro and finish your job every time. The Graco Fusion PC has all the benefits of the Fusion AP, but with 13 simple parts that combine into one disposable