Small, efficient, and reliable, the Air Tool MTB Mini pump features an inverted dual chamber design that moves 20% more air per stroke than previous models, reducing pumping time. It has a twist-locking head convertible to Presta or Schrader valves, a machined outer barrel for grip, and durable aluminum inner and outer chambers. The pump includes a water bottle boss frame mounting bracket and supports a maximum pressure of 60 PSI (4.1 bar) with a volume-per-stroke of 55cc.