Prince Hand Vac Belts for Royal Model 501, 3-501 and 5000,Royal,AX-AY-ABHI-04869" /> Package of (2) Royal / Dirt Devil Hand Vac Belts. Fits Prince models 501, 3-501, 5000 and other Hand Vac models. Royal / Dirt Devil Part Number 3157260001. Royal / Dirt Devil Style 1. Replace every 3 to 6 months to ensure optimum performance.