Leupold is also credited as an early inventor of air pump. The solution is oxygen saturated by an air pump combined with porous stones. This air stone is then connected to an airline that runs to an air pump. The press also contains an air pump. Each lane is equipped with a dedicated propulsion unit, consisting of an electrically-powered air pump. However, the system requires an air pump. Filtration may be aided with an air pump to improve wearer comfort. Originally supplied with air by a manually operated diver's air pump. An air pump is a pump for pushing air. Originally, only the CARB-certified version with an air pump and had been available. The air pump construction was greatly improved by Robert Hooke in 1658. "considered man in their experiments no more than they do mice in an air pump". An air pump can be used to increase dissolved oxygen. This pump was called air pump in 19th century lexicons. A secondary air pump was also added to help meet LEV2.