Water Pump Impeller for Mercury Sierra Tohatsu 2HP 2.5HP 3.5HP 4HP 5HP 6HP Compatible Part#47-16154-3 369-65021-1 18-3098 Water motor impeller have 6 blades.Height:14.30mm,External Impeller Overall Diameter:33.58mm,Internal Shaft Insert Diameter:10.25mm. This aftermarket impeller replaces Mercury outboard motor part #47-16154-3,Tohatsu outboard motor part 369-65021-1, impeller 18-3098. Water pump impeller are 100% brand new and don't used or rebuilt. Similar in design to stock OEM units and require only simple hand tools for installation.Direct replacement,OE level quality and durability. Water pump impeller 100% compatible with OE parts and passed TS16949 certified.Fits for Mercury/Mariner (4-STROKE) Carb 2HP 2.5HP 3HP,Mercury/Mariner (2-STROKE) 4HP 5HP,6HP.