Lezyne Pressure Over Drive Track Pump The Lezyne Pressure Over Drive Track Pump is an innovative floor pump with an integrated system for seating tubeless tyres with minimal fuss. Its secondary chamber can be manually pressurised to high pressure with a stainless steel foot lever releasing the stored compressed air. This discharges a strong, continued blast of air that quickly seats tubeless tyre systems. A durable steel and aluminium construction gives reassuring quality and durability while a wooden handle is practical and stylish. The  ABS1 Pro Tubeless chuck is compatible with both Presta and Schrader valves while the extra-long, nylon-reinforced braided hose eases access for inflation. An accurate analogue gauge ensures you get your tyres to the pressure you want.  In Use: When using your Lezyne Pressure Over Drive floor pump as a regular pump, the air must fill the chamber before it will fill an empty tyre/tube. This may take numerous strokes before the tyre/tube begins to inflate. When topping off a tube/tyre that already has pressure, the chamber will have to reach the same pressure of the tyre/tube before it will start to inflate further.