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This is a replacement ProTek R/C Samurai 321B, RM.1,RM and S03 High Speed Needle. This package includes the high speed needle, as well as one high speed needle o-ring. These o-rings can also be purchases separately (PTK-2540). The high speed needle is used to regulate the fuel flow in the upper throttle range.
This product was added to our catalog on November 6, 2014