Air Tool MTB Floor Pump Back by popular demand, the Air Tool MTB Floor Pump is better than ever. Designed for low pressure, high volume tires, it provides precise pressure to ensure that your tires are set up for whatever the trail throws at you. Oversized 3" (76mm) gauge has 0-40 PSI range for maximum resolution when filling large tires. Massive 508cc volume aluminum barrel pushes enough air to seat tubeless tires. Ergonomic Wing handle with pressure relief valve. Auto selecting SwitchHitter II technology. Includes spare rubber seal for head. Max pressure: 40 PSI (2.7bar) Volume-per-stroke: 508cc