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Thermal Spray Process for Centrifugal Pump Diffuser Sleeve. Stationary cylindrical bushing in the diffuser. Forms a precision running clearance with the rotating part. Reduces internal recirculation and leakage between stages. Renewable; protects the expensive diffuser bore. Helps maintain pump efficiency by keeping clearance tight. Base materials: cast iron, bronze, 304/316 stainless, coated carbon steel.