856A3338G02 is a precision aerospace component compliant with AS9100D quality standards and FAA/EASA regulations, dedicated to aircraft engine auxiliary power unit (APU) lubrication systems.It acts as a lubricating oil pressure relief valve gasket, forming a tight, leak-proof seal at the valve connection during MRO assembly. It effectively blocks oil leakage, ensures stable oil pressure regulation, prevents abnormal pressure buildup or loss in the APU lubrication system, and avoids component wear, overheating and APU malfunction that affects aircraft ground and in-flight power supply.Made of high-temperature oil-resistant nitrile rubber reinforced with aramid fiber, it resists aging and erosion, working stably at -50℃ to 250℃. Weighing 0.05kg, it has excellent resilience for quick replacement, a critical component to guarantee APU lubrication system integrity and aircraft operational safety.