If you're worried about your screws loosening, this washer from Volvo Penta will keep them secure and tight. Use a washer when using a screw fastener, such as a bolt and nut. To keep the screw from pulling away from the nut or bolt head over time. A washer can also prevent leaks, distribute pressure, and lock. Insulating steel screws from aluminum surfaces helps to prevent galvanic corrosion. The first benefit of employing a washer is that it was created to absorb vibrations, provide spacers, and distribute the threaded fastener's weight. Features: Tightness and security are guaranteed. Aids in the prevention of galvanic corrosion Prevent leaks. Spacers can also be made with washers. Washers reduce the possibility of such damage by dispersing the fastener's load uniformly across the material's surface. Volvo Penta Exploded view / schematic Expansion Tank and Aftercooler Specification: Brand: Volvo Penta SKU: 941670 Weight: 0.00 LBS Diagram Reference Number: 36 Manufacturer Part Number (MPN): 941670 Best replacement for: 897511 Volvo Penta Exploded view / schematic Expansion Tank and Aftercooler