The mineral water bottle cap of the ERRV rc boat
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Description
Used on a wind-powered boat, especially with a mineral water bottle cap which has resistance; using this allows you to cut through the water, making the resistance much lower and the use very smooth.
I'm in China, and this cap fits Yibao and Nongfu Spring bottles; I haven't tried other bottles, but it should be similar. It is fixed with an M3 screw, super simple, and works for 5mm-20mm.
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