Designed for compatibility with all Fusion AP guns, Graco's Fusion ProConnect Retrofit Kitincludes a PC42RD mix chamber tip with a 0.042-inch orifice size, suitable for various applications. The retrofit process eliminates the need for purchasing separate fluid section O-rings, simplifying inventory management and reducing costs. Additionally, the kit's design incorporates integrated A/B check valves, effectively containing cross-over and enhancing system integrity. By adopting this retrofit kit, users can maintain the performance of their existing equipment while benefiting from the advanced features of the Fusion PC system.