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

O.S. ENGINES O-RING FOR EXHAUST ADAPTOR NO.4 21RX,21RG
Price:
NZD$6.00
Brand:
O.S. Engine
Model:
OS22826133
Condition:
Brand New
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Adaptor No.4 O-ring for 21RX and 21RG

This O-ring is a compact replacement seal intended specifically for Exhaust Adaptor No.4 on 21RX and 21RG engines. It provides a sealing surface between the adaptor and the exhaust outlet to prevent leaks that can change exhaust characteristics.

Ensure your adaptor matches the No.4 designation and that the engine is a 21RX or 21RG before ordering. The item is sold as a single O-ring and should be treated as a maintenance part rather than an upgrade for performance.

Fitting advice: remove any old gasket material, clean the contact faces, seat the ring squarely in the groove, and avoid overstretching or twisting the O-ring during assembly. Replace if deformed, nicked, or hardened to maintain reliable exhaust sealing.

Do I need special tools to fit this O-ring?

No special tools are required in most cases; clean hands or a soft, non‑sharpened tool are sufficient. Avoid using sharp implements that could cut the O-ring.

Can the old O-ring be reused?

Reusing the old ring is not recommended because it can have compression set or unseen damage. Replace with a new OS22826133 for a reliable seal.

Is this sold as a single item?

Yes, the part is supplied as one individual O-ring intended for servicing Exhaust Adaptor No.4.

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