The Waterco diffuser square ring is designed for compatible HydroStorm, HydroStar, and SupaTuf applications where the diffuser sealing ring needs replacement. A square ring in this role is useful because it helps create the correct sealing profile around the diffuser area, supporting both fit and dependable internal sealing.This replacement is especially useful when the original ring is flattened, cracked, brittle, or no longer sealing with confidence after long service. Because the diffuser area is closely tied to internal flow behavior, refreshing the correct seal can make a meaningful difference in the quality of the rebuild.The 634011 is a practical service part when a compatible Waterco diffuser assembly needs the right square ring to restore cleaner sealing and better internal fit. Waterco diffuser square ring Designed for compatible HydroStorm, HydroStar, and SupaTuf applications Helps restore diffuser-area sealing and fit Useful when the original ring is worn or leaking Supports a more complete internal repair