Switch on the handlebars for double pump and frame steering, the standard model is the switch on the dashboard of the engine.
Switch on the handlebar for Double Pump and Frame steering
Image Gallery: Switch on the handlebar for Double Pump and Frame steering
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http://kranman.com/en/products/accessories/item/384-switch-on-the-handlebar-for-double-pump-and-frame-steering#sigProIdf571248d70