The OS Engines 29122500 Power Box muffler (model E-5020) is the genuine replacement exhaust for the O.S. MAX-120AX two-stroke aircraft engine — the very same Power Box supplied as standard equipment with the engine. Built to deliver reliable exhaust performance, it maintains smooth engine operation and consistent power output while keeping noise to club-friendly levels.

Constructed in aluminium with a silver finish, the E-5020 includes a pressure nipple for fuel tank pressurisation, ensuring consistent fuel delivery throughout the flight. It's the straightforward fix for a muffler that's worn, corroded, crash-damaged or missing from a second-hand engine — a direct factory fit that keeps your 120AX running and sounding exactly as O.S. intended.

Key Features

• Genuine O.S. Engines factory spare part (29122500 / E-5020)
• Suits the O.S. MAX-120AX and MAX-120AX Ring
• Aluminium construction, silver finish
• Pressure nipple for fuel tank pressurisation
• Direct replacement for the standard-equipment muffler

Please note: Mounting hardware and gasket may need to be reused from your existing muffler or purchased separately — check your engine's parts list. For cowled installations, the O.S. 29122600 muffler extension and 90° extension screws (sold separately) allow the exhaust to be routed clear of the cowl.