Mk.III General Service Respirator

The predecessor to the Mk.IV General Service Respirator, and subsequently, the Mk.V GSR as well, the Mk.III was the first military respirator used by Australia post WW1

The Mk.III GSR was made out of a double layer of rubber which was covered with a khaki stockinette, and then attached to the filter via a convoluted hose in a similar fashion to the other General Service Respirators. 

The respirator features two eye pieces made out of splinterless glass, however, unlike the Mk.IV and Mk.V GSRs, they are not removable. These eye pieces would later be used on some models of Australian Light Anti-Gas Respirators.

The outlet valve is similar to the one used in the Civilian Duty Respirator, as well as a lot of other early gas masks from the same time period that the Mk.III was designed in. 

Mk.III utilises a tissot tube system, which uses purified air to demist the lenses via transporting air provided by respirator's intake system through two inlet openings on either side of the lenses.

When the mask was replaced by the Mk.IV General Service Respirator, it was then given to Firefighters and Air Raid wardens, which used them throughout the Second World War.