O.S. Engine OS23818176 Replacement Fuel Nipple No.9 for 20A 20B 20E 20K 21B  [OS23818176]

Replacement Nipple No.9 for O.S. 20A/20B/20E/20K/21B

This universal nipple is a carburettor fuel fitting made to restore a secure connection on the O.S. engine models listed. It is used when the original nipple becomes worn, split, or allows fuel to leak.

Fitment is restricted to the models named in the product title; visually compare the part to your carburettor before fitting. The nipple seats at the fuel inlet or hose end and creates a tidy fuel passage when correctly installed.

To fit, remove the old nipple, align threads or the seating surface with the replacement, then tighten gradually to avoid over-torquing and to achieve a leak-free joint. After fitting, check for fuel tightness at idle and during normal running before full use.

In routine maintenance this part supports stable fuel supply, helping the engine keep consistent throttle response during setup and track runs.