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1. A re-configurable pressure regulator for a breathing apparatus, the regulator comprising an elongated valve housing having a connection device at first and second ends thereof for connection, in use, at one of the ends to a pressurized source of breathable gas and at the other of said ends to a blanking plug, whereby to allow a user to breathe through the regulator from the pressurized source of breathable gas, wherein the regulator can be selectively adapted into one of two configurations comprising:
a first configuration, in which the first end is closed by the blanking plug and the second end is open and connectable to the pressurized source of breathable gas; and a second configuration, in which the second end is closed by the blanking plug and the first end is open and connectable to the pressurized source of breathable gas, the valve housing of said regulator accommodating an elongate valve having a first valve opening at a first end associated with the first end of the valve housing and a second valve opening at a second end associated with the second end of the valve housing, wherein, in said first configuration the elongate valve acts to open and close the second valve opening at the second end of the valve housing, and in said second configuration the elongate valve acts to open and close the first valve opening at the first end of the valve housing, wherein the regulator further comprises a diaphragm case and a diaphragm located therein dividing an interior of the case to provide a first chamber having an inlet and an outlet for communicating breathable gases to and from a user, the first chamber accommodating at least part of the valve housing, the interior of the valve housing defining a second chamber in communication with the first chamber, and valve control means for effecting movement of the elongate valve in accordance with the deflection of the diaphragm in the diaphragm case.
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