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The Lezyne Flip Chuck allows you get the tightest seal possible, using your Lezyne pump, without unthreading the valve core. When using an Air Bleed System equipped Lezyne floor pump to inflate a Presta valve tube, pressing the ABS button releases the air back pressure. Releasing this back pressure allows for the easy removal of the Flip-Thread Chuck without the risk of unscrewing removable Presta valve cores. When inflating Schrader valve tubes, pressing the ABS button releases air from the tube to adjust tire pressure.