Abstract: An apparatus for quick and automatic development of X-ray films, comprising a treatment container whith a bottom shaped like a trapezoid catch well provided with circular holes whose edge is on the same level and flush with the bottom of the catch well, said holes forming slide and/or ledge housings for the tight-fitting element of diaphragm valves placed between the treatment container and the storage and collection containers of the treatment solutions, the circulation of fluids and the driving of such valves being preferably obtained pneumatically.