Genuine Graco Contractor In-Line Valve Gun. Refer to the parts manual for your sprayer to ensure part compatibility. Graco’s dedication to delivering the highest quality products also allows you to protect your investment by offering products that can be repaired to ensure years of reliable service. High quality parts have years of service, but wear parts will need replacement over time. Use Genuine Graco parts to keep your sprayer in peak working order for years to come.