This is a replacement carburetor for the following O.S. engines:
 O.S. .61 VR-M       O.S. .65 VR-M       O.S. .81 VR-M      O.S. .65 VR-DF
 O.S. .91 VR-DF (both the small and large head versions)

Includes:
   One Entire assembled carburetor (Needle valve assembly, carb body, throttle
        arm, carb barrel etc.) and instructions for operation.
   Two M3.5x10 socket head screws for mounting to the engine.
   One Large O-ring seal - This seals the gap between the carb and engine so
        no air leaks.
   One Aluminum arm for inflight needle adjustment - This is an arm that
        installs onto the High-Speed needle valve (when the ratchet spring is
        removed) this can then be connected to an extra servo (on a extra
        PROPORTIONAL channel) for in-flight needle adjustments.
                                                                          ir/jl