Heavy duty double-barrel pump for rapid inflation of tyres and inflatable boats. Rugged steel frame and 470cc air output with each stroke. Cylinders 50 x 120mm. 100psi (7bar) maximum pressure. Heavy duty double-barrel pump for rapid inflation of tyres and inflatable boats. Rugged steel frame and 470cc air output with each stroke. Cylinders 50 x 120mm. 100psi (7bar) maximum pressure.