Abstract: An improved piston and driver structure includes a synthetic piston body, a bifurcated piston insert and a driver secured within the insert by means of a pin and by means of frictional engagement of the driver by the piston insert when the insert is assembled to the piston body. The piston insert has an enlarged top for dissipating operating pressures over the piston body.

Abstract: There is disclosed an automatic firing system for pneumatic tools wherein there is a remote valve to produce actuation of the main valve of the device which remote valve has only one moving part, combined with a selector valve, by means of which the tool may be converted from single fire to auto-fire modes, and in the auto-fire mode the rate of fire may be controlled. The pneumatic circuitry is such that less compressed air is used than in conventional auto-fire tools and thus the tool is more economical than prior art tools.

Abstract: A vapor recovery system for a tank vehicle in which longitudinally extending hollow overturn rails are integrated with the tank, said rails providing preferably a plurality of separate passages which are connected to the tank vents and serve as collectors of volatile vapors emanating from fluids carried in the tank. The passages are connected to individual or to a central vapor collection piping which extends downwardly preferably over the side of the tank or the rear head. The piping terminates in a valve or fitting. Individual piping is used when different liquids are carried in several compartments.