Go Fast Bits GFB Whistling Trumpet 5701 for T9003 T9503

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Go Fast Bits GFB Whistling Trumpet 5701 for T9003 T9503 models The 5701 can be used in place of the standard trumpet on GFB valves (Part ...
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Description:

Go Fast Bits GFB Whistling Trumpet 5701 for T9003 T9503 models

The 5701 can be used in place of the standard trumpet on GFB valves (Part numbers T9003 & T9503), and will make a whistling sound.

However, it is necessary to run the valve so that all (or most) of the air vents through the trumpet Respons valves will typically not generate the velocity required to whistle when set to 50/50 venting.

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