Graco's Mixing Chamber #37 Kit is built for compatibility with Graco's Fusion FX Spray Gun and provides a simple way to maintain or upgrade your spray systems performance. Durable construction and precision engineering help extend the tools lifecycle, even in demanding jobsite conditions. Whether youre replacing worn components or dialing in your equipment for a specific application, the FX37RD mixing chamber offers the balance of flow and pattern needed to support efficiency and accuracy in the field.