Water Pump GM Marine Small Block 4.3L 5.0L 5.7L # 18-3506, 18-3583, 18-3599

Brand New aftermarket water pump without bypass for MerCruiser small block engines. The water pump meets or exceeds factory specifications and is a direct replacement. Fits both composite and non composite timing covers.

Replaces Part # 18-3506, 18-3583, 18-3599, 46-879194401, 879194401
Direct Replacement
Bi-Directional
Stainless Steel Shaft
Stainless Steel Pulley
Stainless Steel Hub