The flexible hose with code P51912-01 is an essential connection component in the MAN L21/31 engine, used for the safe transport of fluids or air between engine systems. Engineered to absorb vibration, movement, and thermal expansion, this hose prevents stress transmission to rigid pipes and fittings. Its reinforced construction ensures resistance to pressure, temperature extremes, and harsh operating environments, contributing to improved system reliability, easier installation, and reduced risk of leaks in marine propulsion and stationary power applications.