21RX and 21RG Compatible Exhaust Adaptor No.4 O-ring - OS22826133 by O.S. Engine  [OS22826133]

O.S. ENGINES O-RING FOR EXHAUST ADAPTOR NO.4 21RX,21RG
Price:
£2.60
Brand:
O.S. Engine
Model:
OS22826133
Condition:
Brand New
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Replacement O-ring for 21RX/21RG exhaust adaptor

This O-ring is a precision replacement seal specified for Exhaust Adaptor No.4 on 21RX and 21RG engines. It forms the seal between the adaptor and the exhaust outlet to prevent leaks that can affect exhaust flow and consistency.

Confirm the adaptor carries the No.4 designation and that your engine is a 21RX or 21RG before fitting. The item is provided as a single O-ring and is intended for regular maintenance rather than as a performance part.

Fitting guidance: remove all old gasket material and contaminants from mating faces, seat the O-ring squarely in the groove, and assemble without twisting to avoid pinching. Swap the seal if it displays cuts, deformation, or loss of elasticity for dependable exhaust sealing.

Will replacing this O-ring change performance?

No. The O-ring is a sealing component and not a performance upgrade. However, replacing a degraded seal can restore consistent exhaust conditions that support repeatable tuning.

How do I verify I have Adaptor No.4?

Check the adaptor for any stamped or printed designation and compare it to parts diagrams; ensure it matches the No.4 item before ordering the OS22826133 O-ring.

Is this a direct replacement part?

This is a replacement service O-ring intended to fit Exhaust Adaptor No.4 on 21RX and 21RG models; verify model and adaptor numbers for compatibility before purchase.

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