The Chapin 4-Way Adjustable Nozzle (#6-4566) will not fit the Chapin Dripless Shut-Off - Xtreme for Industrial Sprayers. The Chapin Brass Adjustable Nozzle (#6-6000) would be compatible.
The Chapin Dripless Shut-Off - Xtreme for Industrial Sprayers (6-813) is only compatible with Chapin Industrial concrete and acetone sprayers (models: 21127, 21127XP, 19149, 19249, 22149 and 22149XP).