The ABS1 Pro is an update over the classic Lezyne ABS Flip-Thread Chuck system. The upgraded 90 design allows the chuck to be more easily installed and removed on valves. It's highly durable construction is built with precision machined aluminum and composite matrix materials and a robust brass swivel. The chuck quickly transforms from Presta to Schrader valves by unthreading the head, flipping it, and rethreading to the chuck. The head then threads onto the valve for superior engagement and no leaking. A bleeder valve is present so you can dial in the pressure for the day's ride. An integrated Presta valve core wrench provides easy valve core tightening or removal for replacing faulty valves, tubeless sealant injection, or to increase airflow to seat pesky tubeless beads. The high-volume version for mountain bike tires and the high-pressure for road tires. Compatible with Lezyne pumps.