Description:

Circulating Water Pump Without Bypass for MerCruiser, OMC, and Volvo Penta Small Block Engines. Replaces Part # 18-3506, 18-3583, 18-3599, 46-879194401, 879194401, 21124846. Direct Replacement - Bi-Directional, Stainless Steel Shaft, Stainless Steel Pulley, Stainless Steel Hub. Fits both composite and non composite timing covers.. For MerCruiser, OMC, Volvo Penta 4.3L, 5.0L, 5.7L GM Engines (Check Your Part Numbers).