120MF257A
Gasket
Mack

A gasket designed to seal mating surfaces, preventing fluid or gas leakage while accommodating minor surface irregularities. Gaskets are critical in engine and subsystem joints where pressure, temperature, and chemical exposure vary. The right gasket material—whether rubber, silicone, or a composite—ensures dependable sealing over the component’s service life, reducing the risk of seepage that can lead to performance loss or corrosion. Gasket selection influences maintenance intervals, as a degraded seal can necessitate more frequent service. Proper seating and surface preparation are key to achieving an effective seal; reusing old gaskets is discouraged as it may compromise integrity. When replacing, ensure compatibility with the service medium and operating conditions to maximize durability. Source One Parts Center notes the gasket’s role in maintaining system integrity and preventing leaks.