An O-Ring is used to raise the clamping pressure around the combustion chamber. The Volvo Penta 955981 O-RING is intended to enhance cylinder sealing in high-pressure applications. The metal components wrap the bore and chamber, enhancing the healing properties of the head gasket. An O-ring is a gasket with a circular loop that connects two working surfaces. If this tiny and otherwise straightforward component is missing, the oil may flow into the valve guides, which are burned inside the combustion chamber. Key Features Can seal and withstand maximum pressure. High-performance sealing power compresses and seals two working surfaces naturally, preventing air or liquid leakage. O-rings are an excellent choice for heat-resistant, long-lasting, and resistant to moisture, steam, silicone, and oil. It doesn't degrade View Volvo Penta Exploded view / schematic Spring Launch Kit Specifications BRAND: Volvo Penta SKU: 955981 Weight: 0.00 LBS Diagram Reference Number: 1 Unit Of Measure: EA Alternate Products SKU: "REC955981", "955981" Manufacturer Part Number (MPN): 955981 This product is the best replacement for 3551602 Volvo Penta Exploded view / schematic Spring Launch Kit