Graco 246215 RAC X 7/8-Inch HandTite Tip Guard Base for Airless Paint Spray Guns with 22-Millimeter Thread The guard acts as a safety device to prevent a person coming into contact with the tip when spraying and also holds the paint sprayer tip in place Fits all Graco products except old-style pole guns This guard is not compatible with Graco's RAC V and IV spray tips