Tub'Air replaces pumps and gas cartridges to inflate bicycle wheels.
Tub'Air is fixed on a tube of the frame (1) having holes (7) for a bottle cage.
The box (2, 2a) is tightened to this hole by a drilled screw. The other hole is sealed.
A Schrader valve (3), like on mountain bike wheels, is part of the box.
In this valve, one can "blow" compressed air in the frame of the bicycle.
With a specific tube, one can now connect the valve to the inner tube of a wheel and inflate a wheel.