Powerful pump combined with a large volume air reservoir for convenient installation of tubeless tyres.to fit tubeless tyres, a strong blast of air is required to ensure that the tyre bead fits properly into the rim to seal the tyre. The JoeBlow™ Booster contains a one litre air reservoir that can be pressurised up to 160psi / 11 bar and then quickly vented into the jacket. The pump is then switched to classic mode and the necessary pressure is simply added. top-quality workmanship is a well-established standard for Topeak. Reservoir: anodized aluminum w/ large cylindrical aluminum chamber Base: steel Gauge: 160 psi / 11 bar analog Handle: Oversize padded / Dual density polymer Head: SmartHead™ DX3 w/ air release button & x-long hose Pressure setting: air release button Dimensions: 74 x 25 x 18.5 cm Weight: 2.9 kg