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From the same minds at Trailair who brought you the Air Ride Pin Box and the Equa Flex rubberized equalizer, comes Rota-Flex, a rubberized and pivoting pin box designed to enhance and smooth your ride. You've put a lot into your investment, so protect it with Rota-Flex. The Rota-Flex Pin Box's pivoting head significantly reduces fore to after coach movement otherwise known as chucking. The rubber compound inside the pin box head assembly absorbs road shock and vibrations so your ride is more comfortable.