Graco Contractor PC ProConnect Replacement Cartridge, 17Y297Graco 17Y297 Contractor PC ProConnect Replacement Cartridge Airless Spray Gun Repair Kit Rebuild Your Spray Gun in Seconds. The Graco Contractor PC ProConnect Replacement Cartridge (17Y297) is the fastest, easiest way to keep your airless spray gun performing like new. This genuine Graco replacement part includes the needle and all key wear components in one simple cartridge so you can get back to spraying in seconds instead of hours. Key Features