This silicone sealing gasket is made as an aftermarket replacement for ARRMA gearboxes, designed to fit the front and rear gearbox housings on Kraton 6S EXB and many related ARRMA 1/7–1/8 platforms. The gasket uses a 3M adhesive backing for a stable, flexible fit that helps keep grease and oil inside the gearbox and away from bearings and other drivetrain parts.
Material and fit are intended for hobby-scale RC gearboxes only, offering resistance to compression and aging so the gasket can be re-used in routine maintenance. It is listed as a direct replacement for the original part ARA311190, providing the same sealing role without modifying the gearbox components.
In practical tuning terms, a well-sealed gearbox helps retain lubrication on the spur gear and pinion gear interfaces and reduces contamination of ball bearings, which can lower maintenance frequency during high-load runs. The adhesive-backed gasket simplifies alignment during reassembly, but care should be taken to seat gear meshes and check bearing play before final closure.
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