Abstract: A manual air pump for two wheel tires comprises means forming a pressure chamber, a head part, a first connecting element for connecting with a bicycle valve and a second connecting element for connecting with an air pin of a motorcycle valve, the head having a connecting passage which connects the first connecting element with the second connecting element and communicates with the pressure chamber, and a closing body arranged movably in the connecting passage so that under the action of its own weight it can close the first connecting element or the second connecting element in one of two different positions of the head.

Abstract: A head of an air pump for inflating pneumatic tires having a motorcycle valve comprises a pot-shaped housing defining a pressure space. The housing is arranged to be connected to an air pump defining a piston space so that the pressure space and the piston space are in communication with one another. A projection is formed integral with the pot-shaped housing and defines a cavity appliable upon a motorcycle valve including a valve body and a spring-biased check valve. A partition is provided between the cavity and the pressure space, the cavity of the projection communicating by at least one air duct passing through the partition with the pressure space. A check valve is provided in the cavity of the projection and is defined by a seal arranged around a lifting pin projecting from the partition into the cavity and leaving free between itself and the lifting pin a connecting duct.