The Grasso Housing Washer is a small but essential component used in refrigeration and HVAC systems. It serves as a spacer or seal between housing parts, such as the top and bottom halves of the housing, ensuring proper alignment and a tight seal. The washer helps prevent leaks, reduce vibrations, and protect the internal components from damage. By maintaining the integrity of the housing assembly, the housing washer contributes to the overall efficiency, reliability, and longevity of the system.