The Truflo Airstore Track Pump For Tubeless Tyres comes with a secondary chamber that can hold up to 260psi of pressure. This allows you to release a short blast of air to blow tubeless tyres onto the rim and get a better seal. Features Dual-chamber design: Secondary cylinder can be pre-loaded to 260 psi and holds pressure for days. Instant air release: Open the air valve on the pump head to unleash the entire chamber in one burst, seating tubeless tyres instantly. Durable construction: Ultra-strong steel base with a stable rubber foot for secure pumping. Comfortable grip: Ergonomic steel handle designed for maximum control. Premium materials: 6063 aluminium barrel rated to 260 psi / 18 bar. Versatile compatibility: Alloy pump head fits both Presta and Schrader valves and includes a reinforced pressure-release valve. Compact yet powerful: 680 mm overall height.