O.S. Engine OS23715000 O-ring Seal for S-15 20K,21D,21VZ-R Carburettor  [OS23715000]

O-ring seal for model carburettors

The O-ring gasket is a small replacement component made to fit the specific RC carburettor codes shown in the product name. It forms a sealed interface between mating carburettor parts to reduce fuel seepage and preserve consistent metering in model engines.

Fitment applies only to the model codes cited in the product name, so verify the carburettor identifier on your RC engine before ordering. This item is provided as a spare sealing element for existing carburettor housings and does not include a complete carburettor.

For installation, detach the carburettor as required, clean the seating surfaces, press the new O-ring into position replacing the old seal, and reassemble with care to avoid pinching. A correct seal helps keep idle steady and lowers the risk of fuel leaks during maintenance and on-track setup.