08-4049-0013-PMA is a precision aerospace replacement component, compliant with AS9100D quality standards and FAA PMA (Parts Manufacturer Approval), designed for the pneumatic systems of large commercial aircraft.

It serves as a pneumatic quick-disconnect coupling seal ring, forming an airtight, pressure-resistant seal between coupling sections. This seal maintains the stable flow of high-pressure pneumatic air that powers systems including door actuation, cargo handling, and cabin pressure regulation, avoiding air leakage that would reduce system efficiency, disrupt operation of aircraft pneumatic functions, or compromise cabin comfort.

Made from wear-resistant, pressure-resistant fluorosilicone rubber, it operates stably at -50°C to 230°C, and resists the corrosive effects of dry pneumatic air. Weighing 0.05kg, it enables fast MRO replacement, a key component for pneumatic system reliability.