The Teflon ring with code 11.01299-0128.A is a precision sealing component used in the MAN L21/31 engine where low friction, chemical resistance, and thermal stability are required. Thanks to the inherent properties of PTFE (Teflon), this ring offers excellent resistance to wear, high temperatures, and aggressive fluids. It is typically applied in dynamic or sensitive sealing areas, where it helps ensure smooth movement, reliable sealing performance, and extended service intervals.