RB Products Head Button
This is a replacement Standard head button for RB Concept Square Stroke .21 engines, such as the Econo 3-port, S5, S7II and WS7II family of engines, and is also included with the Hobby 9, Junior 9 and Series 9 family of engines. This is the same as the head button that comes in the box with these engines.
This product was added to our catalog on December 27, 2005.
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