Abstract: A pressure gauge for a foot pump comprises a housing having a connector portion on an exterior wall thereof which is formed integrally with the housing in a one-piece construction. The connector portion of the one-piece construction includes coupling members formed integrally therewith for connection to a foot pump and to a hose, and includes interior bores which define a chamber for a ball check valve and which also communicate the interior of the connector portion with the interior of the housing. The pressure gauge is preferably of the Bourdon-tube type and includes a spring tube which is pressed into a bore that extends from the interior of the connector portion through an adjacent end wall of the housing portion of the one-piece construction.

Abstract: A cylinder accommodates an elongated bellows tube one end of which is connected to the cylinder and another end of which has a piston sealingly mounted in it so that the piston can move with the bellows tube during expansion and contraction of the latter. The piston in part bounds a pressure chamber in the cylinder outside the bellows tube and is urged to a position in which it closes the chamber. Channels communicate the chamber with one or more tires so that the piston is subject to the inflation pressure of the tire and shifts in the cylinder under concomitant change in the axial length of the bellows tube when changes in the tire inflation pressure occur.