Dramatically reduce cavitation and prop spin with this to install Pump Seal Kit. Location specific, molded inserts fill the voids in pump inlet shoe that bleed air into pump causing cavitation. Recommended for modified craft using RIVA 'GEN-2' Top-Loader Intake Grate (part# RY22110-1). Includes detailed installation instructions. Note: Fits RIVA 'GEN-2' Top-Loader Intake Grate only.