Lezyne ABS Standard Flip-Thread Chuck HP Pump Head AIR BLEED SYSTEM - The most secure valve connection. The ABS button releases air pressure in the pump hose for easy chuck removal without unthreading valve cores. ABS is only featured on Lezyne products. EASY TO FIT AND REMOVE - Releasing the back pressure built up in the air hose allows for the easy removal of the Flip-Thread Chuck without the risk of unscrewing removable Presta valve cores. PRECISE AIR CONTROL - When inflating Schrader valve tubes, pressing the ABS button releases air from the tube to make fine adjustments to tire pressure. SECURE ATTACHMENT - A simple, secure and air-tight threaded connection. The screw on design means that you can count on the Lezyne ABS Chuck to stay securely attached to the hose. A PASSION FOR DESIGN - Every product comes from a combination of a love for cycling and a passion for design. Our products are intelligently engineered and designed, and functionally complete.